Process for production of hexanetriol from 5-hydroxymethylfurfural

ABSTRACT

Industrial scale conversions of 5-hydroxymethylfurfural to commodity chemicals such as 1,2,6-hexanetriol and 1,6-hexanediol by chemocatalytic conversions using hydrogen and a heterogeneous reduction catalyst are provided. The reactions are suitable for use in continuous flow reactors. Methods of carrying out the conversions are provided, as are product and catalyst compositions.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority benefit to U.S. Application Ser. No.62/086,651, filed Dec. 2, 2014, the disclosure of which is hereinincorporated by reference in its entirety.

STATEMENT OF RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSOREDRESEARCH

Not applicable.

BACKGROUND OF THE INVENTION

Commodity chemicals are typically manufactured through the operation ofcontinuous chemical conversion processes. Continuous conversiontechnology typically employs the use of continuous flow reactors, whichoffer certain advantages, such as the ability to prepare large volumesof chemicals (e.g., commodity chemicals) and lower capital andoperational expenditures as compared to methods of production that donot employ continuous conversion technology. Continuous flow reactorscan be used for a variety of transformations and can be operated in thegas or liquid phase.

5-Hydroxymethylfurfural (“HMF”) is a platform chemical producible frombiorenewable resources, particularly carbohydrate-containing feedstocks.The potential of HMF for the production of various compounds useful forfuel, fine chemical, and polymer applications, such as5-alkoxymethylfurfural, 2,5-furandicarboxylic acid,5-hydroxymethylfuroic acid, 2,5-bishydroxymethylfuran,2,5-dimethylfuran, bis(5-methylfurfuryl)ether, levulinic acid, adipicacid, 1,6-hexanediol, caprolactone and caprolactam, has grown with thedevelopment of efficient processes for chemically converting HMF on alarge-scale (van Putten et al. 2013 Chem Rev 113:1499-1597). However,the purity of HMF derived from a carbohydrate source limits thecommercial viability of such processes. HMF is typically prepared fromfructose in the presence of a mineral acid (de Vries et al. 2013 ChemRev 113:1499-1597). This process produces side products such as humins,which are believed to be condensation products from the reactionconstituents and can be oligomeric or polymeric in form. Accordingly,HMF feedstock can contain trace amounts of mineral acids and/or traceamounts of oligomeric or polymeric species which may affect theproduction of HMF conversion products, which are products produceddirectly or indirectly from the conversion of HMF.

The conversion of HMF to 2,5-bishydroxymethylfuran, 1,6-hexanediol, andother HMF conversion products via reduction using hydrogen and aheterogeneous catalyst has been reported. See, for example, Schiavo etal. 1991 Bull Soc Chim Fr 128:704-711; U.S. Pat. No. 7,994,347; U.S.Pat. No. 8,367,851; U.S. Pat. No. 8,742,144; U.S. Pat. No. 3,070,633;U.S. Pat. No. 3,083,236; U.S. Pat. No. 7,579,490; EP Patent No. 2390247;International Publication No. WO 2011/149339; Buntara et al. 2013 CatalToday 210:106-116; Buntara et al. 2011 Angew Chem Int Ed 50:7083-7087;International Publication No. WO 2013/163540; U.S. Pat. No. 3,040,062,Connolly et al. 2010 Org Process Res Dev 14:459-465, Nakagawa 2010 CatalCommun 12:154-156, International Publication Nos. WO 2014/152366 and WO2013/109477, and Besson et al. 2014 Chem Rev 114:1827-1870. Theseprocesses are typically liquid-phase and, while many produce an HMFconversion product, there remain drawbacks that limit their use. First,batch mode conversions produce limited volumes of product, and commoditychemicals, which are needed in large volumes, cannot be produced as costeffectively using a batch mode. Second, reactions carried out usingcontinuous conversion technology are similarly limited if the reactionsemploy any of: (i) low feedstock concentrations (if the feedconcentration is too low, too much energy and expense will be necessaryto recover the target product from the liquid phase); (ii) catalyststhat are unstable under the reaction conditions needed for industrialapplication (such as catalysts that are not stable under many continuoushours on-stream in a continuous flow reactor); or (iii) catalysts thatdo not have the requisite selectively to produce a sufficient volume ofthe target HMF conversion product (high selectivity to the desiredreaction product is desirable as it minimizes the costs associated withthe purification of the product as fewer side products need to beremoved). The limitations of current methods demonstrate the need foralternative methods of converting HMF to target HMF conversion products,such as commodity and specialty chemicals, on a commercial scale.

BRIEF SUMMARY OF THE INVENTION

The present invention addresses one or more of the limitations ofcurrent processes for producing conversion products from HMF.Significantly, the present disclosure provides processes for producingconversion products from HMF on a commercial/industrial scale.

The present disclosure describes continuous conversion processes inwhich HMF is a feedstock in a liquid phase continuous flow reactor andthe transformation of at least a portion of HMF to a conversion productis carried out in a manner which is conducive to producing theconversion product on a commercial scale (for example, at least 5 kTa).The transformations detailed herein may occur in one or more steps andproduce one or more intermediate products in the overall transformationof HMF to the desired, or target, conversion product. In one aspect, thetarget conversion product is 1,2,6-hexanetriol (HTO). In one aspect, thetarget conversion product is 1,6-hexanediol (HDO). In one variation, HTOis produced from HMF via transformation of HMF to the intermediate2,5-bis-hydroxymethylfuran (BHMF) and the transformation of BHMF to HTO.In another variation, HTO is produced from HMF via transformation of HMFto the intermediate BHMF, the transformation of BHMF to the intermediate2,5-bis-hydroxymethyltetrahydrofuran (“BHMTHF”) and the transformationof BHMTHF to HTO. For any transformation in which HTO is a targetconversion product obtained from HMF feedstock, the HTO obtained may befurther transformed to HDO. For any transformation in which anintermediate is employed in the conversion of the HMF feedstock to atarget conversion product, at least a portion of the intermediate in onevariation may be isolated, e.g., if the intermediate is itself a targetproduct. It is also understood that the transformations detailed hereinmay occur as a series of sequential transformations with HMF as thefeedstock (e.g., HMF conversion to BHMF, which BHMF may be converteddirectly to HTO or indirectly to HTO via conversion to BHMTHF which isthen converted to HTO, which HTO may be converted to HDO), or that anysingle transformation (e.g., BHMF to HTO) may occur in isolation, orthat a series of transformations may occur starting with a feedstockother than HMF (e.g., BHMF as a feedstock in the conversion to HTOeither directly or via conversion to BHMTHF, which BHMTHF may beconverted to HTO, which HTO may be converted to HDO).

In one variation, the conversion of HMF to a target conversion productis carried out in a continuous flow reactor in a manner that isconducive to production of the target conversion product on anindustrial scale, wherein at least one of conditions (1)-(4) apply: (1)the HMF feedstock concentration is at or greater than about 5, 10, 12 or15 weight percent; (2) the transformation of HMF employs the use of atleast one heterogeneous reduction catalyst that is stable over thedesired on-stream period (e.g., at least one heterogeneous reductioncatalyst is employed that is stable over an on-stream period of at least150, 300, 500, 1,000, 2,000, 3,000, 4,000, 5,000, 6,000, 7,000, 8,000,9,000, 10,000 hours or more); (3) the transformation of HMF employs theuse of at least one heterogeneous reduction catalyst that is selectivefor the desired transformation (e.g., at least one heterogeneousreduction catalyst is employed that is at least 85%, 90%, 95%, or 99%selective for the desired transformation); and (4) the transformation ofHMF employs the use of at least one heterogeneous reduction catalystthat yields the desired transformation in an acceptable amount forcommercial production (e.g., at least one heterogeneous reductioncatalyst is employed that provides the desired transformation product inat least 80%, 85%, 90%, 95%, or 99% yield). In some variations, at leasttwo, three or all of conditions (1)-(4) apply. In one aspect, all ofconditions (1)-(4) apply and conditions (2)-(4) apply to eachtransformation carried out in the continuous flow reactor, including,e.g., the transformation of HMF to BHMF, the transformation of BHMF toHTO either directly or via conversion to BHMTHF, which BHMTHF istransformed to HTO, and, where applicable, the transformation of BHMTHFto HTO and the transformation of HTO to HDO.

The present invention is directed to industrially scalable processes forcatalytically converting HMF to HTO, HDO and other HMF conversionproducts. The processes feature high feedstock concentrations,conditions promoting long-term catalyst stability and productivity, andhigh conversion and selectivity to the target molecules.

In one aspect, the invention provides a process for preparing2,5-bis-hydroxymethylfuran (BHMF) from 5-hydroxymethylfurfural (HMF).One embodiment comprises feeding 5-hydroxymethylfurfural (HMF) to acontinuous flow reactor for an on-stream period of at least 150 hours;reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or acombination thereof; and forming 2,5-bis-hydroxymethylfuran (BHMF) withat least about 90% selectivity and at least about 85%5-hydroxymethylfurfural (HMF) conversion. In one variation,2,5-bis-hydroxymethylfuran (BHMF) is formed with at least about 90%selectivity and at least about 90% 5-hydroxymethylfurfural (HMF)conversion. In another variation, 2,5-bis-hydroxymethylfuran (BHMF) isformed with at least about 90% selectivity and at least about 95%5-hydroxymethylfurfural (HMF) conversion. In another variation,2,5-bis-hydroxymethylfuran (BHMF) is formed with at least about 95%selectivity and at least about 90% 5-hydroxymethylfurfural (HMF)conversion. In another variation, 2,5-bis-hydroxymethylfuran (BHMF) isformed with at least about 95% selectivity and at least about 95%5-hydroxymethylfurfural (HMF) conversion. In another variation,2,5-bis-hydroxymethylfuran (BHMF) is formed over an on-stream period ofat least 150 hours. Another variation comprises feeding5-hydroxymethylfurfural (HMF) to a continuous flow reactor for anon-stream period of between about 150 hours and 10,000 hours or betweenabout 500 hours and 10,000 hours or between about 1,000 hours and 10,000hours or between about 5,000 hours and 10,000 hours. In anothervariation, 2,5-bis-hydroxymethylfuran (BHMF) is formed over an on-streamperiod of between about 150 hours and 10,000 hours or between about 500hours and 10,000 hours or between about 1,000 hours and 10,000 hours orbetween about 5,000 hours and 10,000 hours. In another variation, theorganic solvent contains less than about 25 weight % water. In anothervariation, the organic solvent contains less than about 10 weight %water. In another variation, the organic solvent contains less thanabout 5 weight % water. In still another variation, the organic solventis substantially free of water. In another variation, the organicsolvent contains water. In another variation, an organic solventcontains up to about 50 weight % water. In another variation an organicsolvent contains up to about 25 weight % water or up to about 10 weight% water. In one variation, the 5-hydroxymethylfurfural (HMF) is fed tothe continuous flow reactor through a guard bed comprising a transitionmetal. In another variation, the guard bed comprises at least onetransition metal selected from the group consisting of Ag, Zn, Cu, Fe,Ni, Co and Pb or a salt or combination thereof. In another variation,the concentration of 5-hydroxymethylfurfural (HMF) is about or greaterthan about 5 weight percent in organic solvent. In such a variation, theconcentration of HMF in the HMF feedstock is about or greater than about5 weight percent. In another variation, the concentration of5-hydroxymethylfurfural (HMF) is between about 5 weight percent and 25weight percent in organic solvent. In still another variation, theconcentration of 5-hydroxymethylfurfural (HMF) is about or greater thanabout 10 weight percent in organic solvent. In another variation, theconcentration of 5-hydroxymethylfurfural (HMF) is between about 10weight percent and 25 weight percent in organic solvent. Anotherembodiment comprises feeding 5-hydroxymethylfurfural (HMF) through aguard bed comprising a transition metal to a continuous flow reactor;reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or acombination thereof; and forming 2,5-bis-hydroxymethylfuran (BHMF). Inone variation, the guard bed comprises at least one transition metalselected from the group consisting of Ag, Zn, Cu, Fe, Ni, Co and Pb or asalt or combination thereof. In a further variation, the guard bedcomprises at least one transition metal selected from the groupconsisting of Ag, Zn, Cu and Pb or a salt or combination thereof. Inanother variation, the concentration of 5-hydroxymethylfurfural (HMF) isgreater than about 5 weight percent in organic solvent. In such anembodiment, the HMF feedstock fed to the continuous flow reactorcomprises HMF in greater than about 5 weight percent in organic solvent,such as about any of 6, 10, 12 and 15 weight percent HMF in organicsolvent or between about 5 to about 25 or between about 10 to about 25weight percent HMF in organic solvent. In another variation, theconcentration of 5-hydroxymethylfurfural (HMF) is between about 5 weightpercent and 25 weight percent in organic solvent. In another variation,the concentration of 5-hydroxymethylfurfural (HMF) is about or greaterthan about 10 weight percent in organic solvent. In another variation,the concentration of 5-hydroxymethylfurfural (HMF) is between about 10weight percent and 25 weight percent in organic solvent. In anothervariation, the concentration of 5-hydroxymethylfurfural (HMF) is aboutor greater than about 12 weight percent in organic solvent. In anothervariation, the concentration of 5-hydroxymethylfurfural (HMF) is betweenabout 12 weight percent and 20 weight percent in organic solvent. Inanother variation, the 5-hydroxymethylfurfural (HMF) is fed to thecontinuous flow reactor for an on-stream period of at least 150 hours.In another variation, the 5-hydroxymethylfurfural (HMF) is fed to thecontinuous flow reactor for an on-stream period of at least any one of300, 500, 1,000, 3,000, 6,000, 8,000 hours or more. In anothervariation, the 2,5-bis-hydroxymethylfuran (BHMF) is formed over anon-stream period of at least any one of 300, 500, 1,000, 3,000, 6,000,8,000 hours or more. Another variation comprises feeding5-hydroxymethylfurfural (HMF) to a continuous flow reactor for anon-stream period of between about 150 hours and 10,000 hours or betweenabout 500 hours and 10,000 hours or between about 1,000 hours and 10,000hours or between about 5,000 hours and 10,000 hours. In anothervariation, 2,5-bis-hydroxymethylfuran (BHMF) is formed over an on-streamperiod of between about 150 hours and 10,000 hours or between about 500hours and 10,000 hours or between about 1,000 hours and 10,000 hours orbetween about 5,000 hours and 10,000 hours. In another variation, the2,5-bis-hydroxymethylfuran (BHMF) is formed with at least about 90%selectivity and at least 85% 5-hydroxymethylfurfural (HMF) conversion.In another variation, the 2,5-bis-hydroxymethylfuran (BHMF) is formedwith at least about 90% selectivity and at least 90%5-hydroxymethylfurfural (HMF) conversion. In another variation, the2,5-bis-hydroxymethylfuran (BHMF) is formed with at least about 90%selectivity and at least 95% 5-hydroxymethylfurfural (HMF) conversion.In another variation, the 2,5-bis-hydroxymethylfuran (BHMF) is formedwith at least about 95% selectivity and at least 85%5-hydroxymethylfurfural (HMF) conversion. In another variation, the2,5-bis-hydroxymethylfuran (BHMF) is formed with at least about 95%selectivity and at least 90% 5-hydroxymethylfurfural (HMF) conversion.In another variation, the 2,5-bis-hydroxymethylfuran (BHMF) is formedwith at least about 95% selectivity and at least 95%5-hydroxymethylfurfural (HMF) conversion.

Another embodiment comprises feeding 5-hydroxymethylfurfural (HMF) to acontinuous flow reactor at a concentration of greater than 6 weightpercent in organic solvent for an on-stream period of at least 150hours; reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of the organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or acombination thereof; and forming 2,5-bis-hydroxymethylfuran (BHMF) overthe on-stream period of at least 150 hours. In one variation, theconcentration of 5-hydroxymethylfurfural (HMF) is about or greater thanabout 10 weight percent in organic solvent. In another variation, theconcentration of 5-hydroxymethylfurfural (HMF) is between about 10weight percent and 25 weight percent in organic solvent. In onevariation, the concentration of 5-hydroxymethylfurfural (HMF) is aboutor greater than about 12 weight percent. In another variation, theconcentration of 5-hydroxymethylfurfural (HMF) is between about 12weight percent and 20 weight percent in organic solvent. In anothervariation, the 5-hydroxymethylfurfural (HMF) is fed to the continuousflow reactor for an on-stream period of at least any one of 300, 500,1,000, 3,000, 6,000, 8,000 hours or more. In another variation, the2,5-bis-hydroxymethylfuran (BHMF) is formed over an on-stream period ofat least any one of 300, 500, 1,000, 3,000, 6,000, 8,000 hours or more.Another variation comprises feeding 5-hydroxymethylfurfural (HMF) to acontinuous flow reactor for an on-stream period of between about 150hours and 10,000 hours or between about 500 hours and 10,000 hours orbetween about 1,000 hours and 10,000 hours or between about 5,000 hoursand 10,000 hours. In another variation, 2,5-bis-hydroxymethylfuran(BHMF) is formed over an on-stream period of between about 150 hours and10,000 hours or between about 500 hours and 10,000 hours or betweenabout 1,000 hours and 10,000 hours or between about 5,000 hours and10,000 hours. In another variation, the 5-hydroxymethylfurfural (HMF) isfed to the continuous flow reactor through a guard bed, which may in onevariation comprise a transition metal. In another variation, the guardbed comprises at least one transition metal selected from the groupconsisting of Ag, Zn, Cu, Fe, Ni, Co and Pb or a salt or combinationthereof. In still another variation, the 2,5-bis-hydroxymethylfuran(BHMF) is formed with at least about 90% selectivity and at least 85%5-hydroxymethylfurfural (HMF) conversion. In still another variation,the 2,5-bis-hydroxymethylfuran (BHMF) is formed with at least about 90%selectivity and at least 90% 5-hydroxymethylfurfural (HMF) conversion.In another variation, the 2,5-bis-hydroxymethylfuran (BHMF) is formedwith at least about 95% selectivity and at least 85%5-hydroxymethylfurfural (HMF) conversion. In another variation, the2,5-bis-hydroxymethylfuran (BHMF) is formed with at least about 95%selectivity and at least 90% 5-hydroxymethylfurfural (HMF) conversion.In another variation, the 2,5-bis-hydroxymethylfuran (BHMF) is formedwith at least about 95% selectivity and at least 95%5-hydroxymethylfurfural (HMF) conversion. In another variation, theorganic solvent is selected from the group consisting of alcohols,esters, ethers and mixtures thereof. In another variation, the organicsolvent contains water. In another variation, the organic solvent is analcohol. In a further variation, the alcohol is selected from the groupconsisting of ethanol, n-propanol, isopropanol, n-butanol, t-butanol,iso-butanol and sec-butanol. In another variation, the organic solventis an ester. In a further variation, the ester is selected from thegroup consisting of ethyl acetate, propyl acetate and butyl acetate. Inanother variation, the organic solvent is an ether. In a furthervariation, the ether is selected from the group consisting of dioxane,dioxolane, glyme, diglyme, triglyme and tetraglyme.

In one variation, the heterogeneous reduction catalyst contains twometals selected from the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Feand Ru. In one variation, the heterogeneous reduction catalyst comprisesa combination of metals selected from the group consisting of Pt—Au,Co—Cu, Ni—Cu, Ag—Ni, Ag—Co and Ag—Ru. In another variation, theheterogeneous reduction catalyst further comprises a modifier. In afurther variation, the modifier is selected from the group consisting ofAu, W, Cu, Zn, Mo, Sb, Bi and Pb. In one variation, the heterogeneousreduction catalyst comprises two metals selected from the groupconsisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru and a modifier selectedfrom the group consisting of Au, W, Cu, Zn, Mo, Sb, Bi and Pb, such as aheterogeneous reduction catalyst comprising Co—Cu(Zn). In anothervariation, the heterogeneous reduction catalyst comprises three metalsselected from the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru,such as a heterogeneous reduction catalyst selected from the groupconsisting of Ni—Co—Cu, Ag—Co—Cu, and Ni—Co—Ag. In another variation,the heterogeneous reduction catalyst comprises three metals selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe, Sc, Ti, V, Mn,Zn and Ru. In another variation, the heterogeneous reduction catalystfurther comprises a catalyst support. In one variation, the catalystsupport is selected from the group consisting of carbons, aluminas,zirconias, silicas, alumina-silicas, titanias, alumina-titanias, siliconcarbides and mixed phases thereof. In yet another variation, the5-hydroxymethylfurfural (HMF) is reacted with hydrogen at a temperaturein a range of about 50° C. to about 150° C. and at a pressure in a rangeof about 50 psi to about 2000 psi.

A further embodiment comprises feeding 5-hydroxymethylfurfural (HMF)through a guard bed comprising a transition metal to a continuous flowreactor at a concentration of greater than about 5 weight percent inorganic solvent for an on-stream period of at least 150 hours; reactingthe 5-hydroxymethylfurfural (HMF) with hydrogen in the continuous flowreactor in the presence of the organic solvent and a heterogeneousreduction catalyst comprising at least one metal selected from the groupconsisting of Ni, Co, Cu, Ag, Pt, Fe and Ru or a combination thereof;and forming 2,5-bis-hydroxymethylfuran (BHMF) with at least about 90%selectivity and at least 85% 5-hydroxymethylfurfural (HMF) conversionover the on-stream period of at least 150 hours.

In another aspect, the invention provides a process for preparing2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from2,5-bis-hydroxymethylfuran (BHMF) comprising reacting2,5-bis-hydroxymethylfuran (BHMF), which may be obtained from any one ofthe above processes or other processes detailed throughout, withhydrogen in a continuous flow reactor in the presence of an organicsolvent and a heterogeneous reduction catalyst comprising at least onemetal selected from the group consisting of Ni, Co, Cu, Ag, Pt, Pd andRu or a combination thereof; and forming2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF). In one variation, theheterogeneous reduction catalyst used in the reaction of2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is the same as ordifferent from the heterogeneous reduction catalyst used in the reactionof 5-hydroxymethylfurfural (HMF) with hydrogen. In another variation,the temperature and pressure in the reaction of2,5-bis-hydroxymethylfuran (BHMF) with hydrogen are the same as ordifferent from the temperature and pressure in the reaction of5-hydroxymethylfurfural (HMF) with hydrogen. In still another variation,the reactor used in the reaction of 2,5-bis-hydroxymethylfuran (BHMF)with hydrogen is the same as or different from the reactor used in thereaction of 5-hydroxymethylfurfural (HMF) with hydrogen.

In another aspect, the invention provides a process for preparing1,2,6-hexanetriol (HTO) from 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) comprising reacting 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF), which may be obtained from the above process for preparing2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from2,5-bis-hydroxymethylfuran (BHMF) or any other processes detailedthroughout, with hydrogen in a continuous flow reactor in the presenceof an aqueous or organic solvent and a heterogeneous reduction catalystcomprising Pt; and forming 1,2,6-hexanetriol (HTO). In some variations,the solvent is an aqueous solvent. In some variations, the solvent is anorganic solvent. In some variations the solvent is 100% water. In somevariations, the solvent is a mixture of water and organic solvent. Insome variations, the solvent is substantially free of water. In onevariation, the heterogeneous reduction catalyst further comprises amodifier selected from the group consisting of Mo, La, Sm, Y, W and Re.In another variation, the heterogeneous reduction catalyst furthercomprises a catalyst support. In one variation, the catalyst support isselected from the group consisting of acidic ion-exchange resin,aluminas (including gamma alumina, fluorinated alumina, silica promotedalumina), zirconias (including sulfate or tungstate promoted zirconia),silicas, alumina-silicas (including silica promoted alumina), titanias,alumina-titanias, aluminum phosphate, tungsten oxide supported on silicaalumina, acidic clay, supported mineral acid and zeolites. In onevariation, the heterogeneous reduction catalyst used in the reaction of2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen is the sameas or different from (i) the heterogeneous reduction catalyst used inthe reaction of 5-hydroxymethylfurfural (HMF) with hydrogen or (ii) theheterogeneous reduction catalyst used in the reaction of2,5-bis-hydroxymethylfuran (BHMF) with hydrogen. In another variation,the temperature and pressure in the reaction of2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen are the sameas or different from (i) the temperature and pressure in the reaction of5-hydroxymethylfurfural (HMF) with hydrogen or (ii) the temperature andpressure in the reaction of 2,5-bis-hydroxymethylfuran (BHMF) withhydrogen. In yet another variation, the reactor used in the reaction of2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen is the sameas or different from (i) the reactor used in the reaction of5-hydroxymethylfurfural (HMF) with hydrogen or (ii) the reactor used inthe reaction of 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen.

In another aspect, the invention provides a process for preparing1,2,6-hexanetriol (HTO) from 2,5-bis-hydroxymethylfuran (BHMF)comprising reacting 2,5-bis-hydroxymethylfuran (BHMF), which may beobtained from any one of the above processes or any other processesdetailed throughout, with hydrogen in a continuous flow reactor in thepresence of an aqueous or organic solvent and a heterogeneous reductioncatalyst comprising at least one metal selected from the groupconsisting of Ni, Co, Cu, Ag, Pt, Pd and Ru or a salt or combinationthereof; and forming 1,2,6-hexanetriol (HTO). In some variations, thesolvent is an aqueous solvent. In some variations, the solvent is anorganic solvent. In some variations the solvent is 100% water. In somevariations, the solvent is a mixture of water and organic solvent. Insome variations, the solvent is substantially free of water. In onevariation, the 2,5-bis-hydroxymethylfuran (BHMF) is reacted withhydrogen at a temperature in a range of about 80° C. to about 180° C.and a pressure in a range of about 50 psi to about 2000 psi. In onevariation, the heterogeneous reduction catalyst used in the reaction of2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is the same as ordifferent from the heterogeneous reduction catalyst used in the reactionof 5-hydroxymethylfurfural (HMF) with hydrogen.

In another aspect, the invention provides a process for preparing1,6-hexanediol (HDO) from 1,2,6-hexanetriol (HTO) comprising reacting1,2,6-hexanetriol (HTO) obtained from one of the above processes forpreparing 1,2,6-hexanetriol (HTO) or any other processes detailedthroughout with hydrogen in a continuous flow reactor in the presence ofa heterogeneous reduction catalyst comprising Pt; and forming1,6-hexanediol (HDO). In one variation, the 1,2,6-hexanetriol (HTO) isreacted with hydrogen in a continuous flow reactor in the presence of anaqueous or organic solvent or a mixture thereof. In some variations, thesolvent is an aqueous solvent. In some variations, the solvent is anorganic solvent. In some variations the solvent is 100% water. In somevariations, the solvent is a mixture of water and organic solvent. Insome variations, the solvent is substantially free of water. In afurther variation, the organic solvent is selected from the groupconsisting of alcohols, esters, ethers and mixtures thereof. In anothervariation, the heterogeneous reduction catalyst further comprises amodifier selected from the group consisting of Mo, La, Sm, Y, W and Re.In another variation, the heterogeneous reduction catalyst furthercomprises a catalyst support. In one variation, the catalyst support isselected from the group consisting of acidic ion-exchange resin,aluminas (including gamma alumina, fluorinated alumina, silica promotedalumina), zirconias (including sulfate or tungstate promoted zirconia),silicas, alumina-silicas (including silica promoted alumina), titanias,alumina-titanias, aluminum phosphate, tungsten oxide supported on silicaalumina, acidic clay, supported mineral acid and zeolites. In anothervariation, the 1,2,6-hexanetriol (HTO) is reacted with hydrogen at atemperature in a range of about 80° C. to about 200° C. and at apressure in a range of about 200 psi to about 2000 psi.

In another aspect, the invention provides a process for preparing1,2,6-hexanetriol (HTO) from 5-hydroxymethylfurfural (HMF). Oneembodiment comprises feeding 5-hydroxymethylfurfural (HMF) to acontinuous flow reactor at a concentration of greater than about 5weight percent in organic solvent; reacting the 5-hydroxymethylfurfural(HMF) with hydrogen in the continuous flow reactor in the presence ofthe organic solvent and a heterogeneous reduction catalyst comprising atleast one metal selected from the group consisting of Ni, Co, Cu, Ag,Pt, Pd, Fe and Ru or a combination thereof; forming2,5-bis-hydroxymethylfuran (BHMF) in a first reactor effluent stream ora first reactor zone effluent stream; reacting the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen, without isolation orpurification of the 2,5-bis-hydroxymethylfuran (BHMF) from the firstreactor effluent stream or the first reactor zone effluent stream, inthe presence of a heterogeneous reduction catalyst; forming2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) in a second reactoreffluent stream or a second reactor zone effluent stream; reacting the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen, withoutisolation or purification of the 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) from the second reactor effluent stream or the second reactorzone effluent stream, in the presence of a heterogeneous reductioncatalyst; and forming 1,2,6-hexanetriol (HTO).

Another embodiment comprises feeding 5-hydroxymethylfurfural (HMF) to acontinuous flow reactor at a concentration of greater than about 5weight percent in an organic solvent; reacting the5-hydroxymethylfurfural (HMF) with hydrogen in the continuous flowreactor in the presence of the organic solvent and a heterogeneousreduction catalyst comprising at least one metal selected from the groupconsisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or a combinationthereof; forming 2,5-bis-hydroxymethylfuran (BHMF) in a first reactoreffluent stream or a first reactor zone effluent stream; reacting the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen, without isolation orpurification of the 2,5-bis-hydroxymethylfuran (BHMF) from the firstreactor effluent stream or the first reactor zone effluent stream, inthe presence of a heterogeneous reduction catalyst; and forming1,2,6-hexanetriol (HTO).

It is understood that the transformations described herein with respectto a reactor effluent stream may also be carried out in connection witha corresponding reactor zone effluent stream. Accordingly, suchtransformations may be carried out in a continuous conversion systemcomprising multiple continuous flow reactors, a single continuous flowreactor comprising multiple reaction zones, or in two or more continuousflow reactors where at least one of the continuous flow reactorscomprises more than one reaction zone.

It is understood that, if applicable, aspects of one variation detailedherein (e.g., and without limitation, aspects such as feedstockconcentration, on-stream period, temperature, pressure, solvent,catalyst composition, catalyst support, etc.) may apply to othervariations detailed throughout the same as if each and every applicableaspect were specifically and individually listed for all embodiments andvariations. An aspect of a first variation may be applicable to a secondvariation if the aspect recited for the first variation does notconflict with that recited for the second variation. For example, andwithout limitation, where a first variation describes particularreaction conditions (e.g., solvent, pressure, and temperature), but asecond variation is silent with respect to the reaction conditions, itis understood that the reaction condition aspects of the first variationmay apply to the second variation because the particular reactionconditions recited do not conflict with the details provided for thesecond variation.

In another aspect, the present disclosure provides a heterogeneousreduction catalyst useful for converting HMF to BHMF, BHMF to BHMTHF orBHMF to HTO as disclosed herein, comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or acombination thereof and a support selected from the group consisting ofcarbons, aluminas, zirconias, silicas, alumina-silicas, titanias,alumina-titanias, silicon carbides and mixed phases thereof.

Reduction catalysts useful for the transformations detailed herein arealso provided. The present disclosure also provides HTO and/or HDOproduced by the process of any of the transformations detailed hereinthat produce HTO and/or HDO.

In another aspect, the invention provides a process for preparing2,5-bis-hydroxymethylfuran (BHMF) from 5-hydroxymethylfurfural (HMF)comprising reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in acontinuous flow reactor in the presence of an organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or acombination thereof to form the 2,5-bis-hydroxymethylfuran (BHMF),wherein the process further comprises one or more of (i)-(iii): (i)forming the 2,5-bis-hydroxymethylfuran (BHMF) over an on-stream periodof at least 150 hours; (ii) feeding the 5-hydroxymethylfurfural (HMF)through a guard bed comprising a transition metal to the continuous flowreactor; and (iii) feeding the 5-hydroxymethylfurfural (HMF) to thecontinuous flow reactor for an on-stream period of at least 150 hours.

In one variation, the reaction proceeds with at least 85% conversion ofthe 5-hydroxymethylfurfural (HMF) (e.g., over an on-stream period of 150hours). In another variation, the process comprises forming the2,5-bis-hydroxymethylfuran (BHMF) with at least about 90% selectivity(e.g., over an on-stream period of 150 hours). In another variation, (i)applies (i.e., forming the 2,5-bis-hydroxymethylfuran (BHMF) over anon-stream period of at least 150 hours). In another variation, (ii)applies (i.e., feeding the 5-hydroxymethylfurfural (HMF) through a guardbed comprising a transition metal to the continuous flow reactor). Insome such variations, the guard bed comprises at least one transitionmetal selected from the group consisting of Ag, Zn, Cu, Fe, Ni, Co andPb or a salt or combination thereof. In another variation, the guard bedcomprises at least one transition metal selected from the groupconsisting of Ag, Zn, Cu and Pb or a salt or combination thereof. Inanother variation, (iii) applies (i.e., feeding the5-hydroxymethylfurfural (HMF) to the continuous flow reactor for anon-stream period of at least 150 hours).

In another variation, the process comprises feeding the5-hydroxymethylfurfural (HMF) to the continuous flow reactor at aconcentration of greater than about 5 weight percent in the organicsolvent. In another variation, the process comprises feeding the5-hydroxymethylfurfural (HMF) to the continuous flow reactor at aconcentration of greater than about 6 weight percent in the organicsolvent. In another variation, the process comprises feeding the5-hydroxymethylfurfural (HMF) to the continuous flow reactor at aconcentration of greater than about 10 weight percent in the organicsolvent. In another variation, the process comprises forming the2,5-bis-hydroxymethylfuran (BHMF) with at least about 90% selectivityand at least 90% 5-hydroxymethylfurfural (HMF) conversion (e.g., over anon-stream period of 150 hours). In another variation, the processcomprises forming the 2,5-bis-hydroxymethylfuran (BHMF) with at leastabout 95% selectivity and at least 90% 5-hydroxymethylfurfural (HMF)conversion (e.g., over an on-stream period of 150 hours). In anothervariation, the process comprises feeding the 5-hydroxymethylfurfural(HMF) to the continuous flow reactor at a concentration of greater thanabout any of 5, 6, 10 and 12 weight percent in the organic solvent andforming the 2,5-bis-hydroxymethylfuran (BHMF) with at least about 90% or95% selectivity and at least 90% 5-hydroxymethylfurfural (HMF)conversion (e.g., over an on-stream period of 150 hours).

In any variation in which an organic solvent is employed, the organicsolvent may comprise less than about 25 weight % water. In anothervariation, the organic solvent comprises less than about 10 weight %water. In another variation, the organic solvent is substantially freeof water. In another variation, the organic solvent is selected from thegroup consisting of alcohols, esters, ethers and mixtures thereof. Inanother variation, the organic solvent comprises an alcohol. In anothervariation, the alcohol is selected from the group consisting of ethanol,n-propanol, isopropanol, n-butanol, t-butanol, iso-butanol andsec-butanol. In another variation, the organic solvent comprises anester. In another variation, the ester is selected from the groupconsisting of methyl acetate, ethyl acetate, propyl acetate and butylacetate. In another variation, the organic solvent comprises an ether.In another variation, the ether is selected from the group consisting ofdioxane, dioxolane, glyme, diglyme, triglyme and tetraglyme.

In another variation, the heterogeneous reduction catalyst used in thereduction of 5-hydroxymethylfurfural (HMF) comprises a combination ofmetals selected from the group consisting of Co—Cu, Ni—Cu, Ag—Ni, Ag—Coand Ag—Ru. In another variation, the heterogeneous reduction catalystfurther comprises a modifier. In another variation, the modifier isselected from the group consisting of Mn, Co, Au, W, Cu, Zn, Mo, Sb, Biand Pb. In another variation, the heterogeneous reduction catalystfurther comprises a catalyst support. In another variation, the catalystsupport is selected from the group consisting of carbons, aluminas,zirconias, silicas, alumina-silicas, titanias, alumina-titanias, siliconcarbides and mixed phases thereof. In another variation, the5-hydroxymethylfurfural (HMF) is reacted with hydrogen at a temperaturein a range of about 50° C. to about 150° C. and at a pressure in a rangeof about 50 psi to about 2000 psi.

In another aspect, the invention provides a process for preparing2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from2,5-bis-hydroxymethylfuran (BHMF) comprising reacting the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen in a continuous flowreactor in the presence of an organic solvent and a heterogeneousreduction catalyst comprising at least one metal selected from the groupconsisting of Ni, Co, Cu, Ag, Pd, Pt and Ru or a combination thereof toform 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF). In anothervariation, the organic solvent used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen comprises less thanabout 25 weight % water. In one variation, the2,5-bis-hydroxymethylfuran (BHMF) is obtained by reaction of5-hydroxymethylfurfural (HMF) with hydrogen according to any of theprocesses described herein. In another variation, the heterogeneousreduction catalyst used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is the same as theheterogeneous reduction catalyst used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen. In another variation, theheterogeneous reduction catalyst used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is different from theheterogeneous reduction catalyst used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen. In another variation, thetemperature and pressure in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen are the same as thetemperature and pressure in the reaction of the 5-hydroxymethylfurfural(HMF) with hydrogen. In another variation, the temperature and pressurein the reaction of the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogenare different from the temperature and pressure in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen. In another variation, thecontinuous flow reactor used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is the same as thecontinuous flow reactor used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen. In another variation, thecontinuous flow reactor used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is different from thecontinuous flow reactor used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen.

In another aspect, the invention provides a process for preparing1,2,6-hexanetriol (HTO) from 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) comprising reacting the 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) with hydrogen in a continuous flow reactor in the presence ofan aqueous or organic solvent and a heterogeneous reduction catalystcomprising at least one metal selected from the group consisting of Ni,Co, Cu, Ag, Pt and Ru or a combination thereof to form 1,2,6-hexanetriol(HTO). In one variation, the 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) is obtained by reaction of 2,5-bis-hydroxymethylfuran (BHMF)with hydrogen according to any of the processes described herein. Insome variations, the solvent is an aqueous solvent. In some variations,the solvent is an organic solvent. In some variations the solvent is100% water. In some variations, the solvent is a mixture of water andorganic solvent. In some variations, the solvent is substantially freeof water. In another variation, the heterogeneous reduction catalystused in the reaction of the 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) with hydrogen is the same as (i) the heterogeneous reductioncatalyst used in the reaction of the 5-hydroxymethylfurfural (HMF) withhydrogen or (ii) the heterogeneous reduction catalyst used in thereaction of the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen. Inanother variation, the heterogeneous reduction catalyst used in thereaction of the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) withhydrogen is different from (i) the heterogeneous reduction catalyst usedin the reaction of the 5-hydroxymethylfurfural (HMF) with hydrogen or(ii) the heterogeneous reduction catalyst used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen. In another variation,the temperature and pressure in the reaction of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen are the sameas (i) the temperature and pressure in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen or (ii) the temperature andpressure in the reaction of the 2,5-bis-hydroxymethylfuran (BHMF) withhydrogen. In another variation, the temperature and pressure in thereaction of the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) withhydrogen are different from (i) the temperature and pressure in thereaction of the 5-hydroxymethylfurfural (HMF) with hydrogen or (ii) thetemperature and pressure in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen. In another variation,the continuous flow reactor used in the reaction of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen is the sameas (i) the continuous flow reactor used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen or (ii) the continuous flowreactor used in the reaction of the 2,5-bis-hydroxymethylfuran (BHMF)with hydrogen. In another variation, the continuous flow reactor used inthe reaction of the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) withhydrogen is different from (i) the continuous flow reactor used in thereaction of the 5-hydroxymethylfurfural (HMF) with hydrogen or (ii) thecontinuous flow reactor used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen. In another variation,the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) is reacted withhydrogen in the presence of an organic solvent comprising less thanabout 25 weight % water.

In another aspect, the invention provides a process for preparing1,2,6-hexanetriol (HTO) from 2,5-bis-hydroxymethylfuran (BHMF)comprising reacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogenin a continuous flow reactor at a pressure in a range of about 50 psi toabout 2000 psi in the presence of an aqueous or organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd and Ru or acombination thereof to form 1,2,6-hexanetriol (HTO). In one variation,the 2,5-bis-hydroxymethylfuran (BHMF) is obtained by reaction of5-hydroxymethylfurfural (HMF) with hydrogen according to any of theprocesses described herein. In some variations, the solvent is anaqueous solvent. In some variations, the solvent is an organic solvent.In some variations the solvent is 100% water. In some variations, thesolvent is a mixture of water and organic solvent. In some variations,the solvent is substantially free of water. In another variation, the2,5-bis-hydroxymethylfuran (BHMF) is reacted with hydrogen at atemperature in a range of about 80° C. to about 180° C. In anothervariation, the heterogeneous reduction catalyst used in the reaction ofthe 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is the same as theheterogeneous reduction catalyst used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen. In another variation, theheterogeneous reduction catalyst used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is different from theheterogeneous reduction catalyst used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen. In another variation, the2,5-bis-hydroxymethylfuran (BHMF) is reacted with hydrogen in thepresence of an organic solvent comprising less than about 25 weight %water.

In another aspect, the invention provides a process for preparing1,6-hexanediol (HDO) from 1,2,6-hexanetriol (HTO) comprising reactingthe 1,2,6-hexanetriol (HTO) with hydrogen in a continuous flow reactorin the presence of a heterogeneous reduction catalyst comprising atleast one metal selected from the group consisting of Ni, Co, Cu, Ag, Ptand Ru or a combination thereof to form 1,6-hexanediol (HDO). In onevariation, the 1,2,6-hexanetriol (HTO) is obtained by any of theprocesses described herein. In another variation, the 1,2,6-hexanetriol(HTO) is reacted with hydrogen in a continuous flow reactor in thepresence of an aqueous or organic solvent or a mixture thereof. In somevariations, the solvent is an aqueous solvent. In some variations, thesolvent is an organic solvent. In some variations the solvent is 100%water. In some variations, the solvent is a mixture of water and organicsolvent. In some variations, the solvent is substantially free of water.In another variation, the 1,2,6-hexanetriol (HTO) is reacted withhydrogen in a continuous flow reactor in the presence of an organicsolvent comprising less than about 25 weight % water. In anothervariation, the organic solvent used in the reaction of the1,2,6-hexanetriol (HTO) with hydrogen is selected from the groupconsisting of alcohols, esters, ethers and mixtures thereof. In anothervariation, the heterogeneous reduction catalyst used in the reaction ofthe 1,2,6-hexanetriol (HTO) with hydrogen further comprises a modifier.In another variation, the modifier used in the reaction of the1,2,6-hexanetriol (HTO) with hydrogen is selected from the groupconsisting of Mn, Co, Au, W, Cu, Zn, Mo, Sb, Bi and Pb. In anothervariation, the heterogeneous reduction catalyst used in the reaction ofthe 1,2,6-hexanetriol (HTO) with hydrogen further comprises a catalystsupport. In another variation, the catalyst support used in the reactionof the 1,2,6-hexanetriol (HTO) with hydrogen is selected from the groupconsisting of carbons, aluminas, zirconias, silicas, alumina-silicas,titanias, alumina-titanias, silicon carbides and mixed phases thereof.In another variation, the 1,2,6-hexanetriol (HTO) is reacted withhydrogen at a temperature in a range of about 80° C. to about 200° C.and at a pressure in a range of about 50 psi to about 2000 psi.

In another aspect, the invention provides a process for preparing1,2,6-hexanetriol (HTO) from 5-hydroxymethylfurfural (HMF) comprising(a) feeding 5-hydroxymethylfurfural (HMF) to a continuous flow reactorat a concentration of greater than about 5 weight percent in a firstorganic solvent; (b) reacting the 5-hydroxymethylfurfural (HMF) withhydrogen in the continuous flow reactor in the presence of the firstorganic solvent and a first heterogeneous reduction catalyst comprisingat least one metal selected from the group consisting of Ni, Co, Cu, Ag,Pt, Pd, Fe and Ru or a combination thereof to form2,5-bis-hydroxymethylfuran (BHMF) in a first reactor effluent stream ora first reactor zone effluent stream; (c) reacting the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen, without isolation orpurification of the 2,5-bis-hydroxymethylfuran (BHMF) from the firstreactor effluent stream or the first reactor zone effluent stream, inthe presence of a second heterogeneous reduction catalyst to form2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) in a second reactoreffluent stream or a second reactor zone effluent stream; and (d)reacting the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) withhydrogen, without isolation or purification of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from the second reactoreffluent stream or the second reactor zone effluent stream, in thepresence of a third heterogeneous reduction catalyst to form the1,2,6-hexanetriol (HTO). In one variation, the first organic solventcomprises less than about 25 weight % water. In another variation, the2,5-bis-hydroxymethylfuran (BHMF) is reacted with hydrogen in thepresence of a second organic solvent comprising less than about 25weight % water. In another variation, the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) is reacted with hydrogenin the presence of a third organic solvent comprising less than about 25weight % water. In another variation, the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) is reacted with hydrogenin the presence of an aqueous solvent. In some variations the solvent is100% water. In some variations, the solvent is a mixture of water andorganic solvent.

In another aspect, the invention provides a process for preparing1,2,6-hexanetriol (HTO) from 5-hydroxymethylfurfural (HMF) comprisingfeeding the 5-hydroxymethylfurfural (HMF) to a continuous flow reactorat a concentration of greater than about 5 weight percent in a firstorganic solvent; reacting the 5-hydroxymethylfurfural (HMF) withhydrogen in the continuous flow reactor in the presence of the firstorganic solvent and a first heterogeneous reduction catalyst comprisingat least one metal selected from the group consisting of Ni, Co, Cu, Ag,Pt, Pd, Fe and Ru or a combination thereof to form2,5-bis-hydroxymethylfuran (BHMF) in a first reactor effluent stream ora first reactor zone effluent stream; and reacting the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen, without isolation orpurification of the 2,5-bis-hydroxymethylfuran (BHMF) from the firstreactor effluent stream or the first reactor zone effluent stream, inthe presence of a second heterogeneous reduction catalyst to form the1,2,6-hexanetriol (HTO). In one variation, the organic solvent comprisesless than about 25 weight % water. In another variation, the2,5-bis-hydroxymethylfuran (BHMF) is reacted with hydrogen in thepresence of a second organic solvent comprising less than about 25weight % water. In another variation, the 2,5-bis-hydroxymethylfuran(BHMF) is reacted with hydrogen in the presence of an aqueous solvent.In some variations the solvent is 100% water. In some variations, thesolvent is a mixture of water and organic solvent.

Another embodiment comprises converting the 1,6-hexanediol (HDO)produced by any of the processes provided herein to one or more of HMDA,adipic acid, caprolactam, caprolactone, a polyol, a polyester polyol, apolyester and a polyurethane. Another embodiment comprises comprisingconverting the 2,5-bis-hydroxymethylfuran (BHMF), the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) or the 1,2,6-hexanetriol(HTO) produced by any of the processes provided herein to any one ormore of a polyol, a polyester polyol, a polyester and a polyurethane.

In one variation of any of the processes provided herein in which acatalyst support is present, the catalyst support is a shaped support.In another variation, the shape of the catalyst support is selected fromthe group consisting of an extrudate, sphere, bead, cylinder, pellet,tablet, multi-lobed shape, ring, star, ripped cylinder, trihole, alphaand wheels.

In one variation of any of the processes provided herein, at least oneof the heterogeneous reduction catalysts comprises at least one metalselected from the group consisting of Ag, Ru, Pd and Pt, and the totalconcentration of the metals is from at least 0.1 weight % to about 15weight % of the total weight of the catalyst. In another variation, atleast one of the heterogeneous reduction catalysts comprises at leastone metal selected from the group consisting of Ni, Cu, Co and Fe, andthe total concentration of the metals is from at least 0.5 weight % toabout 40 weight % of the total weight of the catalyst.

In another aspect, the invention provides a process for preparing2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from2,5-bis-hydroxymethylfuran (BHMF) comprising reacting the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen in a continuous flowreactor at a pressure in a range of about 50 psi to about 2000 psi inthe presence of (i) an organic solvent comprising less than about 25weight % water, and (ii) a heterogeneous reduction catalyst comprisingat least one metal selected from the group consisting of Ni, Co, Cu, Ag,Pd, Pt and Ru or a combination thereof to form the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF).

In another aspect, the invention provides a process for preparing1,2,6-hexanetriol (HTO) from 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) comprising reacting the 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) with hydrogen in a continuous flow reactor at a pressure in arange of about 50 psi to about 2000 psi in the presence of (i) anorganic solvent comprising less than about 25 weight % water, and (ii) aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt and Ru or a combinationthereof to form the 1,2,6-hexanetriol (HTO) with at least about 90%selectivity and at least 85% 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) conversion.

In another aspect, the invention provides a process for preparing1,2,6-hexanetriol (HTO) and 1,6-hexanediol (HDO) from2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) comprising reacting the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen in acontinuous flow reactor at a pressure in a range of about 50 psi toabout 2000 psi in the presence of (i) an organic solvent comprising lessthan about 25 weight % water, and (ii) a heterogeneous reductioncatalyst comprising at least one metal selected from the groupconsisting of Ni, Co, Cu, Ag, Pt and Ru or a combination thereof to formthe 1,2,6-hexanetriol (HTO) and the 1,6-hexanediol (HDO) with at leastabout 90% combined selectivity and at least 85%2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) conversion.

In another aspect, the invention provides a process for preparing2,5-bis-hydroxymethylfuran (BHMF) from 5-hydroxymethylfurfural (HMF)comprising reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in acontinuous flow reactor at a pressure in a range of about 50 psi toabout 2000 psi in the presence of (i) an organic solvent comprising lessthan about 25 weight % water, and (ii) a heterogeneous reductioncatalyst comprising Cu to form the 2,5-bis-hydroxymethylfuran (BHMF)with at least about 90% selectivity and at least 85%5-hydroxymethylfurfural (HMF) conversion. In one variation, the organicsolvent comprises dioxane. In another variation, the organic solventcomprises isopropanol. In another variation, the organic solventcomprises glyme. In another variation, the organic solvent comprisesfrom about 5 weight % to about 20 weight % water. In another variation,the heterogeneous reduction catalyst further comprises an aluminacatalyst support.

In another aspect, the invention provides a process for preparing1,2,6-hexanetriol (HTO) from 5-hydroxymethylfurfural (HMF) comprising(a) reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in acontinuous flow reactor in the presence of (i) a first organic solventcomprising less than about 25 weight % water, and (ii) a firstheterogeneous reduction catalyst comprising Cu to form2,5-bis-hydroxymethylfuran (BHMF); (b) reacting the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen in the presence of (i) asecond organic solvent comprising less than about 25 weight % water, and(ii) a second heterogeneous reduction catalyst comprising Ni to form2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF); and (c) reacting the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen in thepresence of i) a third organic solvent comprising less than about 25weight % water, and (ii) a third heterogeneous reduction catalystcomprising Pt to form the 1,2,6-hexanetriol (HTO). In one variation, the2,5-bis-hydroxymethylfuran (BHMF) is formed in a first reactor effluentstream and is reacted with hydrogen without isolation or purification ofthe 2,5-bis-hydroxymethylfuran (BHMF) from the first reactor effluentstream. In one variation, the 2,5-bis-hydroxymethylfuran (BHMF) isformed in a first reactor zone effluent stream and is reacted withhydrogen without isolation or purification of the2,5-bis-hydroxymethylfuran (BHMF) from the first reactor zone effluentstream. In another variation, the 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) is formed in a second reactor effluent stream and is reactedwith hydrogen without isolation or purification of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from the second reactoreffluent stream. In another variation, the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) is formed in a secondreactor zone effluent stream and is reacted with hydrogen withoutisolation or purification of the 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) from the second reactor zone effluent stream. In anothervariation, one or more of the first, second, and third organic solventscomprises dioxane. In another variation, each of the first, second, andthird organic solvents comprises dioxane. In another variation, one ormore of the first, second, and third organic solvents comprisesisopropanol. In another variation, each of the first, second, and thirdorganic solvents comprises isopropanol. In another variation, one ormore of the first, second, and third organic solvents comprises glyme.In another variation, each of the first, second, and third organicsolvents comprises glyme. In another variation, the third heterogeneousreduction catalyst further comprises tungsten.

In another aspect, the invention provides a process for preparing1,6-hexanediol (HDO) from 5-hydroxymethylfurfural (HMF) comprising (a)reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in a continuousflow reactor in the presence of (i) a first organic solvent comprisingless than about 25 weight % water, and (ii) a first heterogeneousreduction catalyst comprising at least one metal selected from the groupconsisting of Co, Mn, Ni, and Cu or a combination thereof to form2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF); (b) reacting the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen in acontinuous flow reactor the presence of (i) a second organic solventcomprising less than about 25 weight % water, and (ii) a secondheterogeneous reduction catalyst comprising Pt to form the1,6-hexanetriol (HDO). In one variation, the second heterogeneousreduction catalyst further comprises tungsten. In another variation, thereaction of step (a) occurs within a first reaction zone and thereaction of step (b) occurs within a second reaction zone, wherein thefirst and second reaction zones are contained within the same continuousflow reactor. In another variation, the reaction of step (a) occurswithin a first continuous flow reactor, and the reaction of step (b)occurs within a second continuous flow reactor. In another variation,the reaction of step (a) comprises formation of2,5-bis-hydroxymethylfuran (BHMF), and at least a portion of the2,5-bis-hydroxymethylfuran (BHMF) is reacted with hydrogen in thecontinuous flow reactor to form 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF). In another variation, the reaction of step (b) comprisesformation of 1,2,6-hexanetriol (HTO), and at least a portion of the1,2,6-hexanetriol (HTO) is reacted with hydrogen in the continuous flowreactor to form 1,6-hexanediol (HDO). In another variation, one or bothof the first and second organic solvents comprises dioxane. In anothervariation, one or both of the first and second organic solventscomprises isopropanol. In another variation, one or both of the firstand second organic solvents comprises glyme. In another variation, thetemperature in the reaction of step (b) is higher than the temperaturein the reaction of step (a). In another variation, the pressure in thereaction of step (b) is higher than the pressure in the reaction of step(a).

In another aspect, the invention provides a continuous conversion systemfor producing a reduction product, wherein the continuous conversionsystem comprises (i) a first contained area for the reduction of a firstreactant in the presence of hydrogen and a heterogeneous reductioncatalyst comprising Cu; (ii) a second contained area for the reductionof a second reactant in the presence of hydrogen and a heterogeneousreduction catalyst comprising Ni; and (iii) a third contained area forthe reduction of a third reactant in the presence of hydrogen and aheterogeneous reduction catalyst comprising Pt; wherein the containedareas are sequentially coupled such that the second reactant comprisesthe product of the first reduction reaction and the third reactantcomprises the product of the second reduction reaction. In onevariation, the first and second contained areas are contained within asingle continuous flow reactor. In another variation, the second andthird contained areas are contained within a single continuous flowreactor. In another variation, the reduction product comprises1,2,6-hexanetriol (HTO). In another variation, the first reactantcomprises 5-hydroxymethylfurfural (HMF), the second reactant comprises2,5-bis-hydroxymethylfuran (BHMF), and the third reactant comprises2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF). In another variation, thecontinuous conversion system further comprises a guard bed comprising atransition metal. In another variation, the guard bed is coupled to thefirst contained area such that the first reactant can be fed through theguard bed to the first contained area.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 depicts results (BHMF yield and HMF remaining as a function oftime on-stream) for the conversion of HMF to BHMF in isopropanol in afixed bed reactor using a Pt(Au) catalyst on an Al₂O₃ support, asdescribed in Example 1.

FIG. 2 depicts results (BHMF yield and HMF remaining as a function oftime on-stream) for the conversion of HMF to BHMF in isopropanol in afixed bed reactor with a guard bed (Ag on ZrO₂) using a Co—Cu catalyston a ZrO₂ support, as described in Example 2.

FIG. 3 depicts results (BHMF yield and HMF remaining as a function oftime on-stream) for the conversion of HMF to BHMF in isopropanol in afixed bed reactor without a guard bed using a Co—Cu catalyst on a ZrO₂support, as described in Example 3.

FIG. 4 depicts results (BHMF yield and HMF remaining as a function oftime on-stream) for the conversion of HMF to BHMF in water in a fixedbed reactor using a Co—Cu catalyst on a ZrO₂ support, as described inExample 4.

FIG. 5 depicts results (BHMF yield and HMF remaining as a function oftime on-stream) for the conversion of HMF to BHMF in isopropanol in afixed bed reactor with a guard bed (Cu on ZrO₂) using a Pt(Au) catalyston a Al₂O₃ support, as described in Example 5.

FIG. 6 depicts results (BHMF yield and HMF remaining as a function oftime on-stream) for the conversion of HMF to BHMF in isopropanol in afixed bed reactor with a guard bed (Ag on ZrO₂) using a Ag catalyst on aAl₂O₃ support, as described in Example 6.

FIG. 7 depicts results (BHMF yield and HMF remaining as a function oftime on-stream) for the conversion of HMF to BHMF in isopropanol in afixed bed reactor with a guard bed (Ag on Al₂O₃) using a Ag catalyst ona ZrO₂ support, as described in Example 7.

FIG. 8 depicts results (BHMF yield, BHMTHF yield and HMF remaining as afunction of time on-stream) for the consecutive conversion of HMF toBHMF and BHMTHF in isopropanol in a fixed bed reactor with a guard bed(Ag on ZrO₂) using a Ni—Cu catalyst on a ZrO₂ support, as described inExample 8.

FIG. 9 depicts results (BHMF yield, BHMTHF yield and HMF remaining as afunction of time on-stream) for the consecutive conversion of HMF toBHMF to BHMTHF in isopropanol in a fixed bed reactor with a guard bed(Ag on ZrO₂) using a Ni catalyst on a ZrO₂ support, as described inExample 9.

FIG. 10 depicts results (BHMTHF yield and HMF remaining as a function oftime on-stream) for the consecutive conversion of HMF to BHMF to BHMTHFin isopropanol in a fixed bed reactor with a guard bed (Ag on Al₂O₃spheres) using a Ni on Al₂O₃ catalyst extrudate, as described in Example12.

FIG. 11 depicts results (BHMF yield and HMF remaining as a function oftime on-stream) for the conversion of HMF to BHMF in isopropanol in afixed bed reactor with a guard bed (Ag on Al₂O₃ spheres) using a Agcatalyst on Al₂O₃ spheres, as described in Example 13.

FIG. 12 depicts results (BHMF yield and HMF remaining as a function oftime on stream) for the conversion of HMF to BHMF in anisopropanol/water mixture using a commercial Cu/Mn/Al₂O₃ catalyst, asdescribed in Example 14. Data collected between 900-1100 hours on streamis displayed.

FIG. 13 depicts results (BHMF yield and HMF remaining as a function oftime on stream) for the conversion of HMF to BHMF in a dioxane/watermixture using a commercial Cu/Mn/Al₂O₃ catalyst, as described in Example14. Data collected between 1650-1750 hours on stream is displayed.

DETAILED DESCRIPTION OF THE INVENTION Definitions

“About” a parameter or value includes that parameter or value per se.For example, “about X” includes and describes X, per se.

As used herein, the abbreviation “HMF” refers to5-hydroxymethylfurfural, which is also represented by formula 1 (Scheme1).

As used herein, the abbreviation “BHMF” refers to2,5-bis-hydroxymethylfuran, which is also represented by formula 2(Scheme 1).

As used herein, the abbreviation “BHMTHF” refers to2,5-bis-hydroxymethyltetrahydrofuran, which is also represented byformula 3 (Scheme 1).

As used herein, the abbreviation “HTO” refers to 1,2,6-hexanetriol,which is also represented by formula 4 (Scheme 1).

As used herein, the abbreviation “HDO” refers to 1,6-hexanediol, whichis also represented by formula 5 (Scheme 1).

As used herein, the abbreviation “HMDA” refers to hexamethylenediamine.

As used herein, the term “time on-stream” or “on-stream period” refersto the time that a heterogeneous reduction catalyst is operative andproductive, e.g., forming the target molecule.

As used herein, the term “substantially free of water” refers to a watercontent that is less than about 2 weight percent of the overallcomposition. For example, a composition that is substantially free ofwater is a composition wherein less than about 2 weight percent of thecomposition is water.

As used herein, the terms “modifier” and “promoter” refer to a substance(e.g., a metal and/or alloy) that improves the properties of a catalyst,such as activity, selectivity or stability. For example, a catalyticpromoter or modifier may increase, enhance or accelerate the activity ofa catalyst. A modifier or promoter may be combined with a catalyst.

As used herein, the terms “catalyst composition” and “catalystformulation” refer to a composition or formulation comprising a catalystmetal, metal salt or metal combination, a catalyst support andoptionally a modifier.

As used herein, the term “reactor effluent stream” refers to the streamexiting a chemical reactor (e.g., a continuous flow reactor such as afixed bed reactor). A reactor effluent stream can be (1) analyzed todetermine a reaction product(s), (2) processed to isolate a reactionproduct and/or recover a feed chemical (which can be recycled), and/or(3) used as feedstock for a subsequent reaction or downstream reactor. Areaction product can be isolated from a reactor effluent stream by oneor more conventional methods known in the art including, for example,solvent extraction, crystallization or evaporative processes.

As used herein, the term “reactor zone effluent stream” refers to thestream exiting a zone of a chemical reactor containing more than onereaction zone (e.g., a continuous flow reactor such as a fixed bedreactor containing two or more reaction zones). A reactor contains morethan one reaction zone if the reactor has discrete areas differentlyconfigured (such as a first area containing a first catalyst and asecond area containing a second catalyst). A reactor zone effluentstream can be (1) analyzed to determine a reaction product(s), (2)processed to isolate a reaction product and/or recover a feed chemical(which can be recycled), and/or (3) used as feedstock for a subsequentreaction or downstream reactor zone. A reaction product can be isolatedfrom a reactor zone effluent stream by one or more conventional methodsknown in the art including, for example, solvent extraction,crystallization or evaporative processes.

Selectivity and conversion parameters provided herein refer to averageselectivity and conversion as measured over the time course of aparticular transformation. For example, reference to a selectivity of atleast “Y” for the conversion of reactant A to product B refers to theaverage selectivity over the time course of the reaction of A to B. Itis therefore appreciated that, at select time points during the reactionof A to B, the value of Y may be lower than Y, provided that the averageY across the time course of the reaction is at least Y.

In some embodiments, the selectivity of a reaction described herein isat least about 90%, 95%, or 99% over an on-stream period of 150, 300,500, 1,000, 3,000, 5,000, 8,000, or 10,000 hours. In some embodiments,the conversion of a reaction described herein is at least about 85%,90,%, 95%, or 99% over an on-stream period of 150, 300, 500, 1,000,3,000, 5,000, 8,000, or 10,000 hours. In one variation, the selectivityis at least about 90% over an on-stream period of 150 hours. In anothervariation, the conversion is at least about 85% over an on-stream periodof 150 hours. In another variation, the selectivity is at least about90% and the conversion is at least about 90% over an on-stream period of300 hours.

Continuous Conversion Processes for Liquid Phase Production of HTO fromHMF

Disclosed are chemical processes and catalyst formulations useful forthe liquid phase production of 1,2,6-hexanetriol (HTO) from5-hydroxymethylfurfural (HMF). HTO produced from the described processmay be converted to 1,6-hexanediol (HDO). The processes produce thetarget molecules efficiently and selectively and are suitable forcommercial scale production of 1,2,6-hexanetriol (HTO), 1,6-hexanediol(HDO) and related molecules.

The process technology includes several chemocatalytic conversions inthe liquid phase, depicted in Scheme 1. HMF (1), readily derived fromC-6 carbohydrates such as glucose and fructose, can be converted to BHMF(2), and BHMF (2) can be converted to BHMTHF (3) by sequential catalytichydrogenation. BHMTHF (3) can be converted to HTO (4) by catalytichydrogenolysis. Alternatively, BHMF (2) can be converted to HTO (4)directly by catalytic hydrogenation and hydrogenolysis. HTO (4) can beconverted to HDO (5) by selective hydrogenolysis and the HDO producedcan be converted to downstream products such as HMDA, adipic acid,caprolactam, caprolactone, polyols, polyester polyols, polyesters andpolyurethanes, useful for the production of, for example, nylon,polyurethanes and epoxy resins. Furthermore, BHMF (2), BHMTHF (3) andHTO (4) produced from the conversions described herein can be convertedto polyols, polyester polyols, polyesters and polyurethanes, useful forthe production of, for example, nylons, polyurethanes and epoxy resins.

A significant challenge associated with the catalytic conversion ofhighly functionalized biorenewably-derived molecules and intermediatesis catalyst stability. Long term catalyst stability is a necessity forcommodity chemical production, meaning that the catalyst must be stable,productive, and selective under reaction conditions for long periods.The physical and chemical environment within a fixed bed reactor is asignificant factor that influences the stability of the catalyst. Theuse of an aqueous solvent at high temperature is particularlychallenging, especially with respect to the stability of the support andthe propensity for metal leaching from the catalyst. For example,commonly deployed industrial catalyst supports such as aluminas, silicasand zeolites are typically not stable in pure aqueous environments athigh temperature. The continuous fixed bed operations described hereinwere found to provide several advantages. For example, commonly deployedindustrial catalyst supports can be used. Secondly, the use of anorganic solvent with a heat of vaporization lower than water can enablemore cost effective product isolations as less energy will be requiredto remove the solvent by industrial methods such as evaporativedistillation. Thirdly, metal leaching from the catalyst support can bemitigated through the use of an organic solvent. In some instances, thepresence of some water can be beneficial. The presence of water incombination with an organic solvent at the appropriate ratio, such asthose described herein, can improve solubility, which can enable fixedbed operation at higher reactant or product concentrations. The presenceof water may be beneficial to the process by enabling the solubility ofreagents used in previous or subsequent process steps. Furthermore, forcost effective product isolation, an organic solvent-water combinationat the appropriate ratio, such as those described herein, can be removedas an azeotropic mixture by industrial methods such as evaporativedistillation.

The described conversions can be performed in one or more continuousflow reactors. Exemplary continuous flow reactors include fixed bed,continuous stirred tank (CSTR), bubble column and ebullated bedreactors. In one embodiment, the continuous flow reactor is a fixed bedreactor. The described conversions can be performed in differentreaction zones within a continuous flow reactor. In some embodiments,each conversion is performed in a separate continuous flow reactor orwithin a separate reaction zone within one or more continuous flowreactors. In some embodiments, two or more conversions are performedwithin the same reaction zone within a continuous flow reactor.

In a particular variation, at least one of the transformations depictedof Scheme 1 is performed in a continuous flow reactor with HMF as thefeedstock fed to the continuous flow reactor, an organic solventselected from the group consisting of an alcohol, ester and ether, and aheterogeneous reaction catalyst, wherein the concentration of HMF as thefeedstock is about or greater than about 5 weight percent. In onevariation, no more than 5 or 10 weight % water is present in the reactoreffluent stream or the reactor zone effluent stream when HTO isproduced. In one variation, the concentration of HMF as the feedstock isgreater than or equal to 6, 10, 12 or 15 weight percent and wherein nomore than 5 or 10 weight % water is present in the reactor effluentstream or the reactor zone effluent stream or wherein no more than 15,20, or 25 weight % water is present in the reactor effluent stream orthe reactor zone effluent stream. In one such variation, thetransformations of HMF to BHMF to HTO are performed. In another suchvariation, the transformations of HMF to BHMF to BHMTHF to HTO areperformed. The transformation may in one aspect be carried out by aheterogeneous reduction catalyst, which may be the same or different forthe different transformations of Scheme 1, wherein the heterogeneousreduction catalyst performs the desired transformation (e.g., HMF toBHMF or BHMF to HTO, etc.) with at least about any one of 90%, 95% and99% selectivity and at a conversion of least about any one of 85%, 90%,95% and 99% for any of the individual steps in the transformation. Inaddition or alternatively, the transformations may in one aspect becarried out over an on-stream period of at least about any of 150, 300,500, 1,000, 3,000, 5,000, 8,000, 10,000 or more hours. In one aspect,the product of the transformation is formed over an on-stream period ofat least about any of 150, 300, 500, 1,000, 3,000, 5,000, 8,000, 10,000or more hours. The transformations may in one aspect be carried out overan on-stream period of between about 150 hours and 10,000 hours orbetween about 500 hours and 10,000 hours or between about 1,000 hoursand 10,000 hours or between about 5,000 hours and 10,000 hours. Inanother aspect, the product of the transformation is formed over anon-stream period of between about 150 hours and 10,000 hours or betweenabout 500 hours and 10,000 hours or between about 1,000 hours and 10,000hours or between about 5,000 hours and 10,000 hours. In a particularvariation, at least one of the transformations of Scheme 1 (e.g., HMF toBHMF; or BHMF to BHMTHF; or BHMF to HTO; or BHMTHF to HTO; or HMF toBHMF to HTO; or HMF to BHMF to BHMTHF to HTO) is performed in acontinuous flow reactor, wherein the reaction is characterized by one ormore of features (1)-(6): (1) a solution of HMF wherein theconcentration of HMF is any of about or greater than about 5, 6, 10, 12or 15 weight percent of the solution is used as the feedstock in thecontinuous flow reactor; (2) use of an organic solvent selected from thegroup consisting of an alcohol, ester and ether, optionally comprisingwater; (3) use of a heterogeneous reaction catalyst that produces theproduct with at least about any one of 90%, 95% and 99% selectivity andat a conversion of at least about any one of 85%, 90%, 95% and 99% forany of the individual steps in the transformation; (4) no more than 5 or10 weight % water is present in the reactor effluent stream or thereactor zone effluent stream; (5) the transformation is carried out overan on-stream period of at least about any of 150, 300, 500, 1,000,3,000, 5,000, 8,000, 10,000 or more hours; and (6) HMF as the feedstockis fed through a guard bed comprising a transition metal to thecontinuous flow reactor.

It is understood that each of features (1)-(6) may be combined in anymanner or combination, the same as if each and every combination offeatures were specifically and individually listed. In one variation,two of features (1)-(6) are present. For example, a reaction may becharacterized by features (1) and (2), or (1) and (3), or (1) and (4),or (1) and (5), or (1) and (6), or (2) and (3), or (2) and (4), or (2)and (5), or (2) and (6), or (3) and (4), or (3) and (5), or (3) and (6),or (4) and (5), or (4) and (6), or (5) and (6). In another variation,three of features (1)-(6) are present. For example, a reaction may becharacterized by features (1), (3) and (5) or (1), (3) and (6) or (1),(2) and (3), or (2), (3) and (4) or (2), (4) and (5). In anothervariation, four of features (1)-(6) are present. For example, a reactionmay be characterized by features (1), (3), (5) and (6), or (1), (2), (3)and (6), or (1), (2), (3) and (4), or (1), (2), (4) and (6), or (2),(4), (5) and (6). In a further variation, five of features (1)-(6) arepresent. For example, a reaction may be characterized by features (1),(2), (3), (5) and (6), or (1), (2), (3), (4) and (6), or (1), (3), (4),(5) and (6), or (1), (2), (3), (4) and (5). In still another variation,all of features (1)-(6) are present.

Consecutive conversions (e.g., HMF to BHMF to BHMTHF) can be performed(1) using the same catalyst composition or different catalystcompositions, (2) using the same catalyst support or different catalystsupports, (3) in a single reactor or multiple (i.e., two or more)reactors in sequence, and/or (4) under the same process conditions(e.g., reaction temperature, hydrogen pressure, flow rate) or differentprocess conditions. When performed in a single reactor, consecutiveconversions may be performed in multiple (i.e., two or more) reactorzones.

Methods for determining the optimal flow rate are known in the art. Inone embodiment, a flow rate is used that promotes good liquid and gasdistribution to the surface of each catalyst particle across and downthe reactor bed, for example, for a fixed bed reactor. The reactor issized to the desired conversion, accordingly, wherein the width and/orlength of the reactor are determined based on management of masstransfer rates and the heat of reaction.

The continuous flow reactors, organic solvents, feed concentrations andguard beds described above are useful for the processes disclosedherein. Additional features, solvents and/or conditions for each processare noted below.

Conversion of HMF (1) to BHMF (2)

The conversion of HMF (1) to BHMF (2) is, in one variation, performedusing a concentration of HMF in the liquid phase that is sufficientlyhigh for production on an industrial scale. In one embodiment, the feedconcentration of HMF is at or greater than about 5 weight percent. Inanother embodiment, the feed concentration of HMF is at or greater thanabout 6 weight percent. In another embodiment, the feed concentration ofHMF is at or greater than about 10 weight percent. In yet anotherembodiment, the feed concentration of HMF is at or greater than about 12weight percent. In a further embodiment, the feed concentration of HMFis at or greater than about 15 weight percent. In one aspect, the feedconcentration of HMF is at least a value provided herein, but less than50 or 40 or 30 or 25 or 20 or 15 weight percent. In one variation, HMFis used as a feedstock in bulk. In another variation, HMF is provided asa feedstock in a solvent.

Trace impurities such as mineral acids and/or oligomeric or polymericspecies may be present in HMF feedstock which can foul or poison thecatalyst, thereby diminishing its lifetime and performance. A guard bedcan be used to sequester potential impurities from the HMF feedstockprior to reaction with the catalyst. The use of a guard bed can enablelong-term catalyst stability, especially for catalyst formulations thatare sensitive to trace impurities (e.g., catalysts formulationscontaining Ni, Co, Cu or Ag). The composition of a guard bed may beselected based on the known impurities of the feedstock (e.g., HMF) andthe heterogeneous catalyst composition. Catalyst formulations containingprecious metals (e.g., Pt) may be less sensitive to trace impurities;however, a guard bed may still be helpful even for these catalysts whenusing feed concentrations greater than about 10 weight percent. The useof a guard bed has been shown to improve catalyst performance (seeExample 2 and Comparative Example 3) and is thus a significantcontribution to the industrial applicability of the described processes.

For the removal of trace impurities from mineral acids (e.g., chloride,sulfate, phosphate), typical guard beds consist of bases dispersed oninorganic supports (e.g., NaOH on alumina). Such guard beds are notsuitable for liquid phase processes due to the solubility of the base inthe liquid phase.

Metal-based guard beds are suitable for the removal of trace impuritiesfrom mineral acids in the processes of the invention. Exemplary metalsinclude the transition metals Ag, Zn, Cu, Fe, Ni, Co and Pb andcombinations thereof (e.g., Zn—Cu, Ag—Cu, Ag—Zn, Zn—Ag—Cu). In someembodiments, the metal is selected from Ag, Co, Ni, Cu and combinationsthereof. Metals in their metallic states or metal salts may be used.Exemplary metal salts include ZnO, PbO and PbCO₃.

The metals or metal salts may be used with or without a support.Exemplary bulk (unsupported) guard beds include Raney copper or Raneycopper modified with other metals. Exemplary guard bed supports includecarbons, aluminas, zirconias, silicas, alumina-silicas and titanias ormixed phases therefrom. Exemplary supported metal-based guard bedsinclude Cu on ZrO₂, Al₂O₃, TiO₂, SiO₂ or carbon and Ag on ZrO₂, Al₂O₃,TiO₂, SiO₂ or carbon or ZnO on ZrO₂, Al₂O₃, TiO₂, SiO₂.

For the removal of oligomeric or polymeric impurities, the guard bed maycontain a polymer absorbent. Such absorbents may comprise porousabsorbent materials such as activated carbons, silicas, aluminas,alumina-silicas, titanias, zirconias or mixed phases therefrom. In oneembodiment, the guard bed comprises a metal or metal salt supported on aporous absorbent material. Exemplary metal-based guard beds containing aporous absorbent material are Cu on ZrO₂, Al₂O₃, TiO₂, SiO₂ or carbonand Ag on ZrO₂, Al₂O₃, TiO₂, SiO₂ or carbon or ZnO on ZrO₂, Al₂O₃, TiO₂,SiO₂. In some embodiments, an absorbent guard bed is used in combinationwith a metal-based guard bed. The guard bed supports may occur in avariety of shapes, for example, extruded shapes and pressed shapes,including but not limited to spheres, extrudates, pellets (cutextrudates), trilobes, quatralobes, rings and pentarings as described inthe 2014 Saint-Gobain NorPro Catalytic Products brochure and website.Exemplary shapes include extrudates, spheres, beads, cylinders, pellets,tablets, multi-lobed shapes, rings, stars, ripped cylinders, triholes,alphas, wheels, and the like. Formulating the guard bed on a shapedsupport is useful to prevent excessive back pressure during theoperation of fixed bed reactors on commercial scale.

In one embodiment, the guard bed is operated at a temperature range ofabout 20° C. to about 150° C. In another embodiment, the guard bed isoperated at a temperature of about 20° C. to about 100° C.

In one embodiment, the guard bed is operated under a hydrogen pressureof about 15 psi to about 2000 psi. In another embodiment, the hydrogenpressure is about 50 psi to about 1000 psi. In another embodiment, theguard bed is operated at the same hydrogen pressure as the HMFconversion.

The guard bed may be formulated to be regenerated using thermalprocessing conditions when spent. In certain embodiments, a guard bedcan be regenerated by calcining at elevated temperature. The thermalprocess used for regeneration can be conducted under various gaseousatmospheres, e.g., air, nitrogen, hydrogen, and forming gas. In oneembodiment, the guard bed is regenerated by calcining at a temperaturerange of about 200° C. to about 800° C. In another embodiment, the guardbed is regenerated by calcining at a temperature of about 250° C. toabout 600° C.

Organic solvents, such as alcohols, esters, ethers and mixtures thereof,optionally comprising water, are suitable for the conversion of HMF (1)to BHMF (2). Exemplary alcohols include ethanol, n-propanol,isopropanol, n-butanol, t-butanol, iso-butanol and sec-butanol.Exemplary esters include methyl acetate, ethyl acetate, propyl acetateand butyl acetate. Exemplary ethers include dioxane, dioxolane, glyme,diglyme, triglyme and tetraglyme. In one embodiment, the organic solventcontains less than about 25 weight % water. In another embodiment, theorganic solvent contains less than about 10 weight % water. In anotherembodiment, the organic solvent contains less than about 5 weight %water. In another embodiment, the organic solvent is substantially freeof water. In another embodiment, the organic solvent contains water. Inone embodiment, an organic solvent contains up to about 50 weight %water. In another embodiment an organic solvent contains up to about 25weight % water or up to about 10 weight % water. In another embodiment,the organic solvent contains between about 5 and 25 weight % water,between about 15 and 25 weight % water, or between about 10 and 20weight % water. In one embodiment, the organic solvent is an azeotropicmixture comprising water. In one embodiment, the organic solvent isdioxane that contains between about 10 and 20 weight % water. In oneembodiment, the organic solvent is isopropanol that contains betweenabout 10 and 20 weight % water. In one embodiment, the organic solventis glyme that contains between about 10 and 20 weight % water. The useof an organic solvent has been shown to improve catalyst performance(see Example 2 and Comparative Example 4).

The conversion of HMF (1) to BHMF (2) may be carried out underconditions in which less than 50 weight % water is present. In oneembodiment, the conversion of HMF to BHMF is carried out underconditions in which less than 25 weight % water is present. In anotherembodiment, the conversion of HMF to BHMF is carried out underconditions in which less than 20 weight % water is present. In anotherembodiment, the conversion of HMF to BHMF is carried out underconditions in which less than 10 weight % water is present. In anotherembodiment, the conversion of HMF to BHMF is carried out underconditions in which less than 5 weight % water is present.

Suitable heterogeneous reduction catalysts for the conversion of HMF (1)to BHMF (2) are those that contain at least one metal selected from Ni,Co, Cu, Ag, Pt, Pd, Fe and Ru or a combination thereof. In oneembodiment, the heterogeneous reduction catalyst contains at least onemetal selected from Cu, Co, Ag, Ni and Pt. In another embodiment, theheterogeneous reduction catalyst contains a combination of two metalsselected from the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru.Exemplary metal combinations include Co—Cu, Ni—Cu, Ag—Ni, Pt—Au, Ag—Coand Ag—Ru. In another embodiment, the heterogeneous reduction catalystcontains at least one metal selected from Co, Ni and Cu and the loadingis about 0.5 weight % to about 99 weight % (e.g., bulk use, such as aRaney Ni catalyst). In another embodiment, the heterogeneous reductioncatalyst contains at least one metal selected from Ag, Ru, Pd and Pt andthe loading about 0.01 weight % to about 15 weight %, or about 0.1weight % to about 10 weight %. For a bimetallic catalyst, the molarratio of metal 1 to metal 2 (M1:M2) may vary from about 25:1 to about1:25 or from about 25:1 to about 2:1 or from about 20:1 to about 5:1.

The heterogeneous reduction catalyst may be modified with one or moremetals. Suitable modifiers include Mn, Co, Au, W, Cu, Zn, Mo, Sb, Bi andPb. In one variation, the heterogeneous reduction catalyst comprises twometals selected from the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Feand Ru and a modifier selected from the group consisting of Mn, Co, Au,W, Cu, Zn, Mo, Sb, Bi and Pb, such as a heterogeneous reduction catalystcomprising Co—Cu(Zn). In another variation, the heterogeneous reductioncatalyst comprises three metals selected from the group consisting ofNi, Co, Cu, Ag, Pt, Pd, Fe and Ru, such as a heterogeneous reductioncatalyst selected from the group consisting of Ni—Co—Cu, Ag—Co—Cu,Ni—Co—Ag. In another variation, the heterogeneous reduction catalystcomprises three metals selected from the group consisting of Ni, Co, Cu,Ag, Pt, Pd, Fe, Sc, Ti, V, Mn, Zn and Ru. In one variation, the catalystis modified with Au, W, Cu, Zn, Sb, Bi and Pb. In another variation, thecatalyst is modified with Au, Cu, Zn, Sb, Bi and Pb. In yet anothervariation, the catalyst is modified with Mn. Exemplary modifiedcatalysts include modified Ni, Co and Cu catalysts such as Ni(Cu),Co(Cu), Cu(Zn) and Ni(Co—Cu). Another exemplary modified catalyst isCu(Mn). In one embodiment, the molar ratio of catalyst to modifier(catalyst:modifier) is about 200:1 to about 1:10, or about 100:1 toabout 1:2, or about 50:1 to about 1:1.

The heterogeneous reduction catalyst may be supported. Suitable catalystsupports include carbons, aluminas, zirconias, silicas, alumina-silicas,titanias, alumina-titanias, silicon carbides and mixed phases thereof.The catalyst supports may occur in a variety of shapes, for example,extruded shapes and pressed shapes, including but not limited tospheres, extrudates, pellets (cut extrudates), trilobes, quatralobes,rings and pentarings as described in the 2014 Saint-Gobain NorProCatalytic Products brochure and website. Exemplary shapes includeextrudates, spheres, beads, cylinders, pellets, tablets, multi-lobedshapes, rings, stars, ripped cylinders, triholes, alphas, wheels, andthe like. Formulating the catalyst on a shaped support is useful toprevent excessive back pressure during the operation of fixed bedreactors on commercial scale. Catalysts formulations may be distributeduniformly across the shaped support or may be distributed as an outershell on the support, or an egg yolk or a band beneath the outer surfaceof the shaped support. When two or metals are present in the catalystformulation, structure shells containing different metal compositionsacross the shell are possible. In one embodiment, the catalyst supportis a sphere, pellet, cylinder, etc. having a diameter greater than 0.8mm.

In one embodiment, the temperature range for the reaction of HMF withhydrogen is about 50° C. to about 150° C. In another embodiment, thereaction temperature is about 80° C. to about 130° C.

In one embodiment, the hydrogen pressure for the reaction of HMF withhydrogen is about 50 psi to about 2000 psi. In another embodiment, thehydrogen pressure is about 100 psi to about 1500 psi. In still anotherembodiment, the hydrogen pressure is about 200 psi to about 1000 psi.

In one aspect, BHMF (2) is formed from HMF (1) over an on-stream periodof at least about 150 hours. In some embodiments, BHMF is formed over anon-stream period of at least about 300 hours. In further embodiments,BHMF is formed from HMF over an on-stream period of at least about anyof 150, 500, 1,000, 2,000, 3,000, 5,000, 8,000 and 10,000 hours or more.In one aspect, BHMF is formed from HMF over an on-stream period of atleast a value provided herein, but less than 30,000 or 15,000 or 12,000or 10,000 hours. In one aspect, BHMF is formed from HMF over anon-stream period of between about any of 150-10,000, 500-10,000,1,000-10,000, 5,000-10,000, 150-8,000, 300-5,000, 500-3,000,1,000-8,000, 3,000-8,000, and 5,000-7,000 hours. In some embodiments,BHMF is formed over an on-stream period of between one and five or oneand three days. For any of the time periods described for which BHMF isformed, in one variation, the embodiment further comprises (i)maintaining catalyst selectivity of at least about 90%, 95%, or 99% oversuch time period or (ii) producing BHMF in a yield of at least about85%, 90%, 95%, or 99% over such period; or both (i) and (ii).

In one aspect, HMF (1) is fed to a continuous flow reactor over anon-stream period of at least about 150 hours. In some embodiments, HMFis fed to a continuous flow reactor over an on-stream period of at leastabout 300 hours. In further embodiments, HMF is fed to a continuous flowreactor over an on-stream period of at least about any of 150, 500,1,000, 2,000, 3,000, 5,000, 8,000 and 10,000 hours or more. In oneaspect, HMF is fed to a continuous flow reactor over an on-stream periodof at least a value provided herein, but less than 30,000 or 15,000 or12,000 or 10,000 hours. In one aspect, HMF is fed to a continuous flowreactor over an on-stream period of between about any of 150-10,000,500-10,000, 1,000-10,000, 5,000-10,000, 150-8,000, 300-5,000, 500-3,000,1,000-8,000, 3,000-8,000, and 5,000-7,000 hours. In some embodiments,HMF is fed to a continuous flow reactor over an on-stream period ofbetween one and five or one and three days. For any of the time periodsdescribed for which HMF is fed to the continuous flow reactor, in onevariation, the embodiment further comprises (i) maintaining catalystselectivity of at least about 90%, 95%, or 99% over such time period or(ii) producing BHMF in a yield of at least about 85%, 90%, 95%, or 99%over such period; or both (i) and (ii).

BHMF in one aspect is formed from HMF with at least about 90%selectivity. In some embodiments, BHMF is formed from HMF with at leastabout 95% selectivity. In some embodiments, BHMF is formed from HMF withat least about 99% selectivity. The transformation of HMF to BHMF iscarried out in a continuous flow reactor by a heterogeneous reductioncatalyst.

In one variation, at least 85% of HMF is converted to BHMF. In someembodiments, at least 90% HMF is converted to BHMF. In some embodiments,at least 95% HMF is converted to BHMF. In some embodiments, at least 99%HMF is converted to BHMF.

In a particular variation, the transformation of HMF (1) to BHMF (2) iscarried out in a continuous flow reactor by a heterogeneous reductioncatalyst, forming BHMF with at least about 80% or 85% or 90% or 95% or99% selectivity and with an HMF conversion of at least 75% or 80% or 85%or 90% or 95% or 99%. In one variation the transformation of HMF (1) toBHMF (2) is carried out on a commercial scale.

Also provided is a reactor effluent stream comprising BHMF produced bythe method of converting HMF to BHMF as detailed herein. It isunderstood that a reactor zone effluent stream comprising BHMF may alsobe produced by the method of converting HMF to BHMF as detailed herein.

Conversion of BHMF (2) to BHMTHF (3)

Organic solvents, such as alcohols, esters, ethers and mixtures thereof,are suitable for the conversion of BHMF (2) to BHMTHF (3). Exemplaryalcohols include ethanol, n-propanol, isopropanol, n-butanol, t-butanol,iso-butanol and sec-butanol. Exemplary esters include methyl acetate,ethyl acetate, propyl acetate and butyl acetate. Exemplary ethersinclude dioxane, dioxolane, glyme, diglyme, triglyme and tetraglyme. Inone embodiment, the organic solvent contains less than about 25 weight %water. In another embodiment, the organic solvent contains less thanabout 10 weight % water. In another embodiment, the organic solventcontains less than about 5 weight % water. In another embodiment, theorganic solvent is substantially free of water. In another embodiment,the organic solvent contains water. In one embodiment, an organicsolvent contains up to about 50 weight % water. In another embodiment anorganic solvent contains up to about 25 weight % water or up to about 10weight % water. In another embodiment, the organic solvent containsbetween about 5 and 25 weight % water, between about 15 and 25 weight %water, or between about 10 and 20 weight % water. In one embodiment, theorganic solvent is an azeotropic mixture comprising water. In oneembodiment, the organic solvent is dioxane that contains between about10 and 20 weight % water. In one embodiment, the organic solvent isisopropanol that contains between about 10 and 20 weight % water. In oneembodiment, the organic solvent is glyme that contains between about 10and 20 weight % water. The use of an organic solvent has been shown toimprove catalyst performance (see Example 2 and Comparative Example 4).

The conversion of BHMF (2) to BHMTHF (3) may be carried out underconditions in which less than 50 weight % water is present. In oneembodiment, the conversion of BHMF to BHMTHF is carried out underconditions in which less than 25 weight % water is present. In anotherembodiment, the conversion of BHMF to BHMTHF is carried out underconditions in which less than 20 weight % water is present. In anotherembodiment, the conversion of BHMF to BHMTHF is carried out underconditions in which less than 10 weight % water is present. In anotherembodiment, the conversion of BHMF to BHMTHF is carried out underconditions in which less than 5 weight % water is present.

Suitable heterogeneous reduction catalysts for the conversion of BHMF(2) to BHMTHF (3) are those that contain at least one metal selectedfrom Ni, Co, Cu, Ag, Pt, Pd and Ru or a combination thereof. In oneembodiment, the heterogeneous reduction catalyst contains at least onemetal selected from Ni, Co, Pd, Ru and Pt. In another embodiment, theheterogeneous reduction catalyst contains at least one metal selectedfrom Ni, Pd, Co and Pt. Exemplary metal combinations include Co—Cu,Ni—Cu, Ru—Cu, Ag—Ni, Ag—Co, Ag—Ru and Cu—Co—Ni. In another embodiment,the heterogeneous reduction catalyst contains at least one metalselected from Co, Ni and Cu and the loading is about 0.5 weight % toabout 99 weight % (e.g., bulk use, such as a Raney Ni catalyst). Inanother embodiment, the heterogeneous reduction catalyst contains atleast one metal selected from Ag, Ru, Pd and Pt and the loading about0.01 weight % to about 15 weight %, or about 0.1 weight % to about 10weight %. For a bimetallic catalyst, the molar ratio of metal 1 to metal2 (M1:M2) may vary from about 25:1 to about 1:25 or from about 25:1 toabout 2:1 or from about 20:1 to about 5:1.

The heterogeneous reduction catalyst may be modified with one or moremetals. Suitable modifiers include Mn, Co, Au, W, Cu, Zn, Mo, Sb, Bi andPb. Exemplary modified catalysts include modified Ni, Co and Cucatalysts such as Ni(Cu), Co(Cu), Cu(Zn) and Ni(Co—Cu). Anotherexemplary modified catalyst is Cu(Mn). In one embodiment, the molarratio of catalyst to modifier (catalyst:modifier) is about 200:1 toabout 1:10, or about 100:1 to about 1:2, or about 50:1 to about 1:1.

The heterogeneous reduction catalyst may be supported. Suitable catalystsupports include carbons, aluminas, zirconias, silicas, alumina-silicas,titanias, alumina-titanias, silicon carbides and mixed phases thereof.The catalyst supports may occur in a variety of shapes, for example,extruded shapes, spheres, beads, cylinders, pellets, tablets,multi-lobed shapes, rings, stars, ripped cylinders, triholes, alphas,wheels, and the like.

In one embodiment, the temperature range for the reaction of BHMF withhydrogen is about 50° C. to about 150° C. In another embodiment, thereaction temperature is about 80° C. to about 130° C.

In one embodiment, the hydrogen pressure for the reaction of BHMF withhydrogen is about 50 psi to about 2000 psi. In another embodiment, thehydrogen pressure is about 100 psi to about 1500 psi. In still anotherembodiment, the hydrogen pressure is about 200 psi to about 1000 psi.

In one aspect, BHMTHF (3) is formed from BHMF (2) over an on-streamperiod of at least 150 hours. In some embodiments, BHMTHF is formed fromBHMF over an on-stream period of at least 300 hours. In furtherembodiments, BHMTHF is formed from BHMF over an on-stream period of atleast about any of 500, 1,000, 2,000, 3,000, 5,000, 8,000 and 10,000hours or more. In one aspect, BHMTHF is formed from BHMF over anon-stream period of at least a value provided herein but less than15,000 or 12,000 or 10,000 hours. In one aspect, BHMTHF is formed fromBHMF over an on-stream period of between about any of 150-10,000,500-10,000, 1,000-10,000, 5,000-10,000, 150-8,000, 300-5,000, 500-3,000,1,000-8,000, 3,000-8,000, and 5,000-7,000 hours. For any of the timeperiods described for which BHMF is fed to the continuous flow reactor,in one variation, the embodiment further comprises (i) maintainingcatalyst selectivity of at least about 90%, 95%, or 99% over such timeperiod or (ii) producing BHMTHF in a yield of at least about 85%, 90%,95%, or 99% over such period; or both (i) and (ii).

BHMTHF in one aspect is formed from BHMF with at least about 90%selectivity. In some embodiments, BHMTHF is formed from BHMF with atleast about 95% selectivity. In some embodiments, BHMTHF is formed fromBHMF with at least about 99% selectivity. The transformation of BHMF toBHMTHF is carried out in a continuous flow reactor by a heterogeneousreduction catalyst.

In one variation, at least 85% of BHMF is converted to BHMTHF. In someembodiments, at least 90% BHMF is converted to BHMTHF. In someembodiments, at least 95% BHMF is converted to BHMTHF. In someembodiments, at least 99% BHMF is converted to BHMTHF.

In a particular variation, the transformation of BHMF (2) to BHMTHF (3)is carried out in a continuous flow reactor by a heterogeneous reductioncatalyst, forming BHMTHF with at least about 80% or 85% or 90% or 95% or99% selectivity and with a BHMF conversion of at least 75% or 80% or 85%or 90% or 95% or 99%. In some variations, the transformation of BHMF (2)to BHMTHF (3) is carried out on a commercial scale.

Also provided is a reactor effluent stream comprising BHMTHF produced bythe method of converting BHMF to BHMTHF as detailed herein. It isunderstood that a reactor zone effluent stream comprising BHMTHFproduced by the method of converting BHMF to BHMTHF as detailed hereinis also provided.

The catalyst composition may be the same as or different from thecatalyst composition used for the HMF to BHMF conversion. Similarly, theprocess conditions (e.g., reaction temperature, hydrogen pressure, flowrate) may be the same as or different from the process conditions usedfor the HMF to BHMF conversion.

Consecutive Conversion of HMF (1) to BHMF (2) to BHMTHF (3)

In one aspect, HMF (1) is converted to BHMF (2) and the BHMF so producedis converted to BHMTHF (3) without isolating or purifying the BHMF, butrather passing the BHMF directly to the catalyst used for the conversionof BHMF to BHMTHF.

Suitable organic solvents and heterogeneous reduction catalysts for theconversion of HMF (1) to BHMF (2) and the conversion of BHMF (2) toBHMTHF (3) are as described above.

The catalyst composition for the HMF (1) to BHMF (2) conversion may bethe same as or different from the catalyst composition for the BHMF (2)to BHMTHF (3) conversion. In one aspect, the catalyst composition forthe HMF to BHMF conversion is the same as the catalyst composition forthe conversion of BHMF to BHMTHF. In one aspect, the catalystcomposition for the HMF to BHMF conversion is different from thecatalyst composition for the conversion of BHMF to BHMTHF. Similarly,the catalyst support for the HMF to BHMF conversion may be the same asor different from the catalyst support for the BHMF to BHMTHFconversion. In one embodiment, the catalyst support is the same. Inanother embodiment, the catalyst support is different.

The conversion of HMF to BHMF and the conversion of BHMF to BHMTHF maybe carried out on the same or different continuous flow reactors or inthe same or different reaction zones within a continuous flow reactor.In one embodiment, the conversion of HMF to BHMF and the conversion ofBHMF to BHMTHF are carried out two different continuous flow reactors.In another embodiment, the conversion of HMF to BHMF and the conversionof BHMF to BHMTHF are carried out in two different reaction zones withina continuous flow reactor. In another embodiment, the conversion of HMFto BHMF and the conversion of BHMF to BHMTHF are carried out in the samereaction zone within a continuous flow reactor.

HMF may be reduced to BHMF using a heterogeneous reduction catalystcontaining metals known to be more mild reduction catalysts such as Cu,Ag (and Pt). The reduction of BHMF to BHMTHF typically requires acatalyst containing metals known to be stronger reduction catalysts suchas Ni, Co, Pd and Ru. In some embodiments, metals such as Pt, Ni or Coare used as a single catalyst in the consecutive reduction of HMF toBHMF to BHMTHF.

Suitable conditions (e.g., reaction temperature, hydrogen pressure, flowrate, solvent) for the conversion of HMF (1) to BHMF (2) and theconversion of BHMF (2) to BHMTHF (3) are as described above. The processconditions for the HMF to BHMF conversion may be the same as ordifferent from the process conditions for the BHMF to BHMTHF conversion.In some embodiments the process conditions are the same. In otherembodiments the process conditions are different. In some embodiments,the temperature of the BHMF to BHMTHF conversion is different from thetemperature of the HMF to BHMF conversion. In one embodiment, thetemperature of the BHMF to BHMTHF conversion is higher than thetemperature of the HMF to BHMF conversion. In some embodiments, theconversion of HMF to BHMF and the conversion of BHMF to BHMTHF arecarried out in the same solvent. In some embodiments, the conversion ofHMF to BHMF and the conversion of BHMF to BHMTHF are carried out indifferent solvents.

In one embodiment, the temperature of the HMF (1) to BHMF (2) conversionis about 70° C. to about 120° C. or about 70° C. to about 100° C. In oneembodiment, the temperature of the BHMF (2) to BHMTHF (3) conversion isabout 80° C. to about 150° C. or about 80° C. to about 130° C.

In one embodiment, the consecutive conversion of HMF (1) to BHMF (2) toBHMTHF (3) is conducted using a guard column and a single catalyst in asingle reactor with two temperature zones. In another embodiment, theconsecutive conversion of HMF to BHMF to BHMTHF is conducted using aguard column and a single catalyst in a single reactor with a singletemperature zone. In another embodiment, the consecutive conversion ofHMF to BHMF to BHMTHF is conducted using a guard column and twocatalysts in two reactors (e.g., one catalyst per reactor where thecatalysts are different from each other) arranged in sequence, and thetemperatures of the two reactors are the same or different.

BHMTHF in one aspect is formed from BHMF with at least about 90%selectivity. In some embodiments, BHMTHF is formed from BHMF with atleast about 95% selectivity. In some embodiments, BHMTHF is formed fromBHMF with at least about 99% selectivity.

In one aspect, at least 85% of HMF is converted to BHMTHF. In someembodiments, at least 90% of HMF is converted to BHMTHF.

In one aspect, BHMTHF is formed from the consecutive conversion of HMFto BHMF to BHMTHF over an on-stream period of at least 150 hours. Insome embodiments, BHMTHF is formed from the consecutive conversion ofHMF to BHMF to BHMTHF over an on-stream period of at least 300 hours. Infurther embodiments, BHMTHF is formed from the consecutive conversion ofHMF to BHMF to BHMTHF over an on-stream period of at least about any of500, 1,000, 2,000, 3,000, 5,000, 8,000 and 10,000 hours or more. In oneaspect, BHMTHF is formed from the consecutive conversion of HMF to BHMFto BHMTHF over an on-stream period of at least a value provided hereinbut less than 15,000 or 12,000 or 10,000 hours. In one aspect, BHMTHF isformed from the consecutive conversion of HMF to BHMF to BHMTHF over anon-stream period of between about any of 150-10,000, 500-10,000,1,000-10,000, 5,000-10,000, 150-8,000, 300-5,000, 500-3,000,1,000-8,000, 3,000-8,000, and 5,000-7,000 hours. For any of the timeperiods described for which HMF is fed to the continuous flow reactor,in one variation, the embodiment further comprises (i) maintainingcatalyst selectivity of at least about 90%, 95%, or 99% over such timeperiod or (ii) producing BHMTHF in a yield of at least about 85%, 90%,95%, or 99% over such period; or both (i) and (ii).

BHMTHF in one aspect is formed from the consecutive conversion of HMF toBHMF to BHMTHF with at least about 90% selectivity at each step in theconversion. In some embodiments, BHMTHF is formed from the consecutiveconversion of HMF to BHMF to BHMTHF with at least about 95% selectivityat each step in the conversion. In some embodiments, BHMTHF is formedfrom the consecutive conversion of HMF to BHMF to BHMTHF with at leastabout 99% selectivity at each step in the conversion. The consecutiveconversion of HMF to BHMF to BHMTHF may be carried out in a continuousflow reactor by a heterogeneous reduction catalyst.

In one variation, BHMTHF is produced with a conversion of at least 85%at each step of the consecutive conversion of HMF to BHMF to BHMTHF. Insome embodiments, BHMTHF is produced with a conversion of at least 90%at each step of the consecutive conversion of HMF to BHMF to BHMTHF. Insome embodiments, BHMTHF is produced with a conversion of at least 95%at each step of the consecutive conversion of HMF to BHMF to BHMTHF. Insome embodiments, BHMTHF is produced with a conversion of at least 99%at each step of the consecutive conversion of HMF to BHMF to BHMTHF.

In a particular variation, the consecutive conversion of HMF to BHMF toBHMTHF is carried out in a continuous flow reactor by a heterogeneousreduction catalyst, forming BHMTHF with at least about 80% or 85% or 90%or 95% or 99% selectivity and with a conversion of at least 75% or 80%or 85% or 90% or 95% or 99% at each step of the consecutive conversionof HMF to BHMF to BHMTHF. In some variations, the consecutive conversionof HMF to BHMF to BHMTHF is carried out on a commercial scale.

Also provided is a reactor effluent stream comprising BHMTHF produced bythe consecutive conversion of HMF to BHMF to BHMTHF, as detailed herein.It is understood that a reactor zone effluent stream comprising BHMTHFproduced by the method of converting HMF to BHMF to BHMTHF as detailedherein is also provided.

In one variation, the consecutive conversion of HMF to BHMF to BHMTHFemploys the use of a guard bed by feeding HMF through a guard bedcomprising a transition metal to a continuous flow reactor.Alternatively or in addition, in another variation, the consecutiveconversion of HMF to BHMF to BHMTHF employs HMF as a feedstock at aboutor greater than about any of 5, 6, 10, 12 or 15 weight percent or more.

In some embodiments the consecutive conversion of HMF (1) produces amixture of BHMF (2) and BHMTHF (3).

Conversion of BHMTHF (3) to HTO (4)

Solvents such water, alcohols, esters, ethers, ketones and mixturesthereof are suitable for the conversion of BHMTHF (3) to HTO (4).Exemplary alcohols include ethanol, n-propanol, isopropanol, n-butanol,t-butanol, iso-butanol and sec-butanol. Exemplary esters include methylacetate, ethyl acetate, propyl acetate and butyl acetate. Exemplaryethers include dioxane, dioxolane, glyme, diglyme, triglyme andtetraglyme. In one embodiment, the solvent is an organic solvent thatcontains less than about 25 weight % water. In another embodiment, theorganic solvent contains less than about 10 weight % water. In anotherembodiment, the organic solvent contains less than about 5 weight %water. In another embodiment, the organic solvent is substantially freeof water. In another embodiment, the organic solvent contains water. Inone embodiment, an organic solvent contains up to about 50 weight %water. In another embodiment an organic solvent contains up to about 25weight % water or up to about 10 weight % water. In one embodiment, theorganic solvent contains between about 5 and 25 weight % water, betweenabout 15 and 25 weight % water, or between about 10 and 20 weight %water. In one embodiment, the organic solvent is an azeotropic mixturecomprising water. In one embodiment, the organic solvent is dioxane thatcontains between about 10 and 20 weight % water. In one embodiment, theorganic solvent is isopropanol that contains between about 10 and 20weight % water. In one embodiment, the organic solvent is glyme thatcontains between about 10 and 20 weight % water. In one embodiment, thesolvent is water.

The conversion of BHMTHF (3) to HTO (4) may be carried out underconditions in which less than 50 weight % water is present. In oneembodiment, the conversion of BHMTHF to HTO is carried out underconditions in which less than 25 weight % water is present. In anotherembodiment, the conversion of BHMTHF to HTO is carried out underconditions in which less than 20 weight % water is present. In anotherembodiment, the conversion of BHMTHF to HTO is carried out underconditions in which less than 10 weight % water is present. In anotherembodiment, the conversion of BHMTHF to HTO is carried out underconditions in which less than 5 weight % water is present.

Suitable heterogeneous reduction catalysts for the conversion of BHMTHF(3) to HTO (4) are supported heterogeneous catalysts comprising Pt. Incertain embodiments of the present invention where the catalystcomprises platinum, platinum is present as Pt(0), which can be usedalone or in combination with other metals and/or alloys, and which ispresent on at least an external surface of a support (i.e., a surfaceexposed to the reaction constituents). In accordance with certainembodiments of the present invention, the catalysts employed in theprocesses comprise Pt and at least one metal selected from the group ofMo, La, Sm, Y, W, and Re (M2). In various embodiments of the inventionone or more other d-block metals, one or more rare earth metals (e.g.,lanthanides), and/or one or more main group metals (e.g., Al) may alsobe present in combination with the Pt and M2 combinations. Typically,the total weight of metal(s) is from about 0.1% to about 10%, or from0.2% to 10%, or from about 0.2% to about 8%, or from about 0.2% to about5%, of the total weight of the catalyst. In some embodiments the totalweight of metal of the catalyst is less than about 4%. The molar ratioof Pt (M1) to (M2) may vary, for example, from about 20:1 to about 1:10.In one embodiment, the M1:M2 molar ratio is in the range of from about10:1 to about 1:5. In another embodiment, the ratio of M1:M2 is in therange of about 8:1 to about 1:2.

In one embodiment, the catalyst is a supported heterogeneous catalyst,wherein the catalyst is on the surface of the support. Suitable supportsinclude, for example, acidic ion-exchange resin, gamma alumina,fluorinated alumina, sulfate or tungstate promoted zirconia, titania,silica, silica promoted alumina, aluminum phosphate, tungsten oxidesupported on silica-alumina, acidic clay, supported mineral acid, andzeolites. The support materials may be modified using methods known inthe art such as heat treatment, acid treatment or by the introduction ofa dopant (for example, metal-doped titanias, metal-doped zirconias(e.g., tungstated-zirconia), metal-doped cerias, and metal-modifiedniobias). In one embodiment, the catalyst support is selected fromzirconias, silicas, and zeolites. When a catalyst support is used, themetals may be deposited using procedures known in the art including, butnot limited to incipient wetness, ion-exchange,deposition-precipitation, and vacuum impregnation. When two or moremetals are deposited on the same support, they may be depositedsequentially or simultaneously. In various embodiments, following metaldeposition, the catalyst is dried at a temperature in the range of about20° C. to about 120° C. for a period of time ranging from at least about1 hour to about 24 hours. In these and other embodiments, the catalystis dried under sub-atmospheric pressure conditions. In variousembodiments, the catalyst is reduced after drying (e.g., by flowing 5%H₂ in N₂ at a temperature of at least about 200° C. for a period of time(e.g., at least about 3 hours)). Still further, in these and otherembodiments, the catalyst is calcined in air at a temperature of atleast about 200° C. for a period of time of at least about 3 hours.

In one embodiment, the conversion of BHMTHF (3) to HTO (4) is conductedat temperatures in the range of from about 60° C. to about 200° C. Inanother embodiment, the conversion of BHMTHF to HTO is conducted attemperatures in the range of from about 80° C. to about 200° C. Inanother embodiment, the conversion is conducted at temperatures in therange of from about 100° C. to about 180° C.

In one embodiment, the conversion of BHMTHF (3) to HTO (4) is conductedat hydrogen pressures in the range of from about 200 psi to about 2000psi. In another embodiment, the conversion of BHMTHF to HTO is conductedat hydrogen pressures in the range of from about 50 psi to about 2000psi.

In one aspect, HTO (4) is formed from BHMTHF (3) over an on-streamperiod of at least about 150 hours. In some embodiments, HTO is formedfrom BHMTHF over an on-stream period of at least about 300 hours. Infurther embodiments, HTO is formed from BHMTHF over an on-stream periodof at least about any of 500, 1,000, 2,000, 3,000, 5,000, 8,000 and10,000 hours or more. In one aspect, HTO is formed from BHMTHF over anon-stream period of at least a value provided herein but less than15,000 or 12,000 or 10,000 hours. In one aspect, HTO is formed fromBHMTHF over an on-stream period of between about any of 150-10,000,500-10,000, 1,000-10,000, 5,000-10,000, 150-8,000, 300-5,000, 500-3,000,1,000-8,000, 3,000-8,000 and 5,000-7,000 hours. For any of the timeperiods described for which BHMTHF is fed to the continuous flowreactor, in one variation, the embodiment further comprises (i)maintaining catalyst selectivity of at least about 90%, 95%, or 99% oversuch time period or (ii) producing HTO in a yield of at least about 85%,90%, 95%, or 99% over such period; or both (i) and (ii).

In some embodiments, HTO (4) and HDO (5) are formed. In one aspect, thecombined selectivity for HTO and HDO is at least about 75%. In someembodiments, HTO and HDO are formed from BHMTHF with at least about 80%combined selectivity. In some embodiments, HTO and HDO are formed fromBHMTHF with at least about 85% combined selectivity. In otherembodiments, HTO and HDO are formed from BHMTHF with at least about 90%combined selectivity. In still other embodiments, HTO and HDO are formedfrom BHMTHF with at least about 95% combined selectivity. For any of thetime periods described for which BHMTHF is fed to the continuous flowreactor, in one variation, the embodiment further comprises (i)maintaining catalyst selectivity of at least about 90%, 95%, or 99% oversuch time period or (ii) producing HTO and/or HDO in a yield of at leastabout 85%, 90%, 95%, or 99% over such period; or both (i) and (ii).

In other embodiments, HTO (4) is formed selectively, for example, byreducing the temperature or time at which the conversion is conducted.Accordingly, in one aspect, the selectivity for HTO is at least about80%. In some embodiments, HTO is formed from BHMTHF with at least about85% selectivity. In some embodiments, HTO is formed from BHMTHF with atleast about 90% selectivity. In some embodiments, HTO is formed fromBHMTHF with at least about 95% selectivity.

In one variation, at least 50% BHMTHF is converted to HTO and HDO. Insome embodiments, at least 60% BHMTHF is converted to HTO and HDO. Insome embodiments, at least 70% BHMTHF is converted to HTO and HDO. Insome embodiments, at least 80% BHMTHF is converted to HTO and HDO. Insome embodiments, at least 90% BHMTHF is converted to HTO and HDO. Inother embodiments, at least 95% BHMTHF is converted to HTO and HDO. Instill other embodiments, at least 99% BHMTHF is converted to HTO andHDO.

In a particular variation, the transformation of BHMTHF to HTO iscarried out in a continuous flow reactor by a heterogeneous reductioncatalyst comprising Pt, forming HTO and HDO with at least about 70% or75% or 80% or 85% or 90% or 95% combined selectivity and with a BHMTHFconversion of at least 40% or 50% or 60% or 70% or 80% or 90% or 95% or99%. In some variations, the transformation of BHMTHF to HTO is carriedout on a commercial scale.

Also provided is a reactor effluent stream or a reactor zone effluentstream comprising HTO (4) and HDO (5) produced by the method ofconverting BHMTHF to HTO and HDO detailed herein. In some embodiments,the reactor effluent stream or reactor zone effluent stream comprises amixture of BHMTHF, HTO, and HDO. The reactor effluent stream or reactorzone effluent stream may be recycled or fed back into the continuousflow reactor or reaction zone from which it exited in order to convertunreacted BHMTHF to HTO and HDO and/or to enrich the reactor effluentstream or reactor zone effluent stream in HTO or HDO. The reactoreffluent stream or reactor zone effluent stream may be directly fed backinto the continuous flow reactor in a concerted process, or it may becollected and fed back into the continuous flow reactor at a later time.

Consecutive Conversion of BHMF (2) to BHMTHF (3) to HTO (4)

In one variation, BHMF (which may be obtained from HMF as detailedthroughout) is converted to BHMTHF and the BHMTHF so produced isconverted to 1,2,6-hexanetriol (HTO) without isolating or purifying theBHMTHF, but rather passing the BHMTHF directly to the catalyst used forthe conversion of the BHMTHF to HTO.

Suitable solvents and heterogeneous reduction catalysts for theconversion of BHMF (2) to BHMTHF (3) and the conversion of BHMTHF (3) toHTO (4) are as described above. The solvent for the conversion of BHMF(2) to BHMTHF (3) may be the same as or different from the solvent forthe conversion of BHMTHF (3) to HTO (4). In one aspect, the solvent forthe BHMF (2) to BHMTHF (3) conversion is the same as the solvent for theBHMTHF (3) to HTO (4) conversion. In one aspect, the solvent for theBHMF (2) to BHMTHF (3) conversion is different from the solvent for theBHMTHF (3) to HTO (4) conversion. When, for example, the solvent for theBHMF (2) to BHMTHF (3) conversion is an organic solvent and the solventfor the BHMTHF (3) to HTO (4) conversion is an aqueous solvent, asolvent transition or exchange using an evaporative method, e.g.,distillation, or a membrane separation method is contemplated. When thesolvent for the BHMF (2) to BHMTHF (3) conversion is an organic solventand the solvent for the BHMTHF (3) to HTO (4) conversion is an aqueoussolvent, the organic solvent may contain water, for example, less than50 or 40 or 30 or 20 or 15 weight %, and the aqueous solvent may containorganic solvent, for example, less than 30 or 25 or 20 or 15 weight %.When the solvent for a conversion is an organic solvent and the solventfor the subsequent conversion is an aqueous solvent, the organic solventmay be substantially free of water and/or the aqueous solvent may besubstantially free of organic solvent.

The catalyst composition for the BHMTHF to HTO conversion may be thesame as or different from the catalyst composition for the BHMF toBHMTHF conversion. In one aspect, the catalyst composition for theBHMTHF to HTO conversion is the same as the catalyst composition for theconversion of BHMF to BHMTHF. In one aspect, the catalyst compositionfor the BHMTHF to HTO conversion is different from the catalystcomposition for the conversion of BHMF to BHMTHF. Similarly, thecatalyst support for the BHMTHF to HTO conversion may be the same as ordifferent from the catalyst support for the BHMF to BHMTHF conversion.In one embodiment, the catalyst support is the same. In anotherembodiment, the catalyst support is different.

The conversion of BHMF to BHMTHF and the conversion of BHMTHF to HTO maybe carried out on the same or different continuous flow reactors or inthe same or different reaction zones within a continuous flow reactor.In one embodiment, the conversion of BHMF to BHMTHF and the conversionof BHMTHF to HTO are carried out two different continuous flow reactors.In another embodiment, the conversion of BHMF to BHMTHF and theconversion of BHMTHF to HTO are carried out in two different reactionzones within a continuous flow reactor. In another embodiment, theconversion of BHMF to BHMTHF and the conversion of BHMTHF to HTO arecarried out in the same reaction zone within a continuous flow reactor.

In one embodiment, the temperature range for the consecutive conversionis about 80° C. to about 180° C. In another embodiment, the reactiontemperature is about 100° C. to about 180° C.

In one embodiment, the hydrogen pressure for the consecutive conversionis about 50 psi to about 2000 psi. In another embodiment, the hydrogenpressure is about 100 psi to about 1500 psi. In still anotherembodiment, the hydrogen pressure is about 200 psi to about 1000 psi.The process conditions (e.g., reaction temperature, hydrogen pressure,flow rate) for the BHMTHF to HTO conversion may be the same as ordifferent from the process conditions for the BHMF to BHMTHF conversion.In some embodiments the process conditions are the same. In otherembodiments the process conditions are different. In some embodiments,the temperature of the BHMTHF to HTO conversion is different from thetemperature of the BHMF to BHMTHF conversion.

In one embodiment, the consecutive conversion of BHMF to BHMTHF to HTOis conducted using a single catalyst in a single reactor with twotemperature zones. In another embodiment, the consecutive conversion ofBHMF to BHMTHF to HTO is conducted using two catalysts in a singlereactor with two temperature zones (e.g., one catalyst per temperaturezone, where the catalysts are different from each other). In anotherembodiment, the consecutive conversion of BHMF to BHMTHF to HTO isconducted using two catalysts in two reactors arranged in sequence(e.g., one catalyst per reactor where the catalysts are different fromeach other), and the temperatures of the two reactors are the same ordifferent.

In one aspect, 1,2,6-hexanetriol (HTO) and 1,6-hexanediol (HDO) can beformed from BHMF with at least about 70% combined selectivity. In someembodiments, 1,2,6-hexanetriol (HTO) and 1,6-hexanediol (HDO) are formedfrom BHMF with at least about 80% combined selectivity. In otherembodiments, 1,2,6-hexanetriol (HTO) and 1,6-hexanediol (HDO) are formedfrom BHMF with at least about 90% combined selectivity.

In other embodiments, 1,2,6-hexanetriol (HTO) is formed from BHMFselectively. In one embodiment, HTO (4) is formed from BHMF selectivelyby reducing the temperature at which the consecutive conversion isconducted. Accordingly, in one aspect, the selectivity for HTO is atleast about 80%. In some embodiments, HTO is formed from BHMF with atleast about 85% selectivity. In some embodiments, HTO is formed fromBHMF with at least about 90% selectivity. In some embodiments, HTO isformed from BHMF with at least about 95% selectivity.

In one aspect, HTO is formed from the consecutive conversion of BHMF toBHMTHF to HTO over an on-stream period of at least 150 hours. In someembodiments, HTO is formed from the consecutive conversion of BHMF toBHMTHF to HTO over an on-stream period of at least 300 hours. In furtherembodiments, HTO is formed from the consecutive conversion of BHMF toBHMTHF to HTO over an on-stream period of at least about any of 500,1,000, 2,000, 3,000, 5,000, 8,000 and 10,000 hours or more. In oneaspect, HTO is formed from the consecutive conversion of BHMF to BHMTHFto HTO over an on-stream period of at least a value provided herein butless than 15,000 or 12,000 or 10,000 hours. In one aspect, HTO is formedfrom the consecutive conversion of BHMF to BHMTHF to HTO over anon-stream period of between about any of 150-10,000, 500-10,000,1,000-10,000, 5,000-10,000, 150-8,000, 300-5,000, 500-3,000,1,000-8,000, 3,000-8,000, and 5,000-7,000 hours. For any of the timeperiods described for which BHMF is fed to the continuous flow reactor,in one variation, the embodiment further comprises (i) maintainingcatalyst selectivity of at least about 90%, 95%, or 99% over such timeperiod or (ii) producing HTO in a yield of at least about 85%, 90%, 95%,or 99% over such period; or both (i) and (ii).

HTO in one aspect is formed from the consecutive conversion of BHMF toBHMTHF to HTO with at least about 70% selectivity at each step in theconversion. In some embodiments, HTO is formed from the consecutiveconversion of BHMF to BHMTHF to HTO with at least about 80% selectivityat each step in the conversion. In some embodiments, HTO is formed fromthe consecutive conversion of BHMF to BHMTHF to HTO with at least about90% selectivity at each step in the conversion. The consecutiveconversion of BHMF to BHMTHF to HTO is carried out in a continuous flowreactor by a heterogeneous reduction catalyst.

In one variation, HTO is produced with a conversion of at least 85% ateach step of the consecutive conversion of BHMF to BHMTHF to HTO. Insome embodiments, HTO is produced with a conversion of at least 90% ateach step of the consecutive conversion of BHMF to BHMTHF to HTO. Insome embodiments, HTO is produced with a conversion of at least 95% ateach step of the consecutive conversion of BHMF to BHMTHF to HTO. Insome embodiments, HTO is produced with a conversion of at least 99% ateach step of the consecutive conversion of BHMF to BHMTHF to HTO.

In a particular variation, the consecutive conversion of BHMF to BHMTHFto HTO is carried out in a continuous flow reactor by a heterogeneousreduction catalyst, forming HTO with at least about 70% or 75% or 80% or85% or 90% or 95% selectivity and with a conversion of at least 75% or80% or 85% or 90% or 95% or 99% at each step of the consecutiveconversion of BHMF to BHMTHF to HTO. In some variations, the consecutiveconversion of BHMF to BHMTHF to HTO is carried out on a commercialscale.

Also provided is a reactor effluent stream or reactor zone effluentstream comprising HTO (4) produced by the consecutive conversion of BHMF(2) to BHMTHF (3) to HTO (4) as detailed herein. In a particular aspect,the reactor effluent stream or reactor zone effluent stream contains nomore than 10 weight % or 5 weight % or is substantially free of water.In another variation, the effluent stream comprising HTO furthercomprises water (e.g., when water is used as a solvent in the conversionof BHMTHF to HTO).

In one variation, the consecutive conversion of HMF to BHMF to BHMTHF toHTO employs the production of BHMF from HMF and the use of a guard bedby feeding HMF through a guard bed comprising a transition metal to acontinuous flow reactor. Alternatively or in addition, in anothervariation, the consecutive conversion of BHMF to BHMTHF to HTO employsthe production of BHMF from HMF as a feedstock at about or greater thanabout any of 5, 6, 10, 12 or 15 weight percent or more.

In some embodiments, the consecutive conversion of BHMF (2) produces amixture of HTO (4) and BHMTHF (3).

Consecutive Conversion of HMF (1) to BHMF (2) to BHMTHF (3) to HTO (4)

In one aspect, HMF (1) is converted to BHMF (2), the BHMF so produced isconverted to BHMTHF (3), and the BHMTHF so produced is converted to HTO(4) without isolating or purifying the BHMF or BHMTHF, but ratherpassing the BHMF directly to the catalyst used for the conversion ofBHMF to BHMTHF and passing the BHMTHF directly to the catalyst used forthe conversion of BHMTHF to HTO.

Suitable solvents and heterogeneous reduction catalysts for theconversion of HMF (1) to BHMF (2), the conversion of BHMF (2) to BHMTHF(3), and the conversion of BHMTHF (3) to HTO (4) are as described above.The solvent for the HMF (1) to BHMF (2) conversion may be the same as ordifferent from the solvent for the BHMF (2) to BHMTHF (3) conversion,which solvent may be the same as or different from the solvent for theBHMTHF (3) to HTO (4) conversion. In one aspect, the solvent for the HMF(1) to BHMF (2) conversion is the same as the solvent for the BHMF (2)to BHMTHF (3) conversion, which is the same as the solvent for theBHMTHF (3) to HTO (4) conversion. In one aspect, the solvent for the HMF(1) to BHMF (2) conversion is different from the solvent for the BHMF(2) to BHMTHF (3) conversion, and the solvent for the BHMF (2) to BHMTHF(3) conversion is the same as the solvent for the BHMTHF (3) to HTO (4)conversion. In one aspect, the solvent for the HMF (1) to BHMF (2)conversion is different from the solvent for the BHMF (2) to BHMTHF (3)conversion, and the solvent for the BHMTHF (3) to HTO (4) conversion isthe same as the solvent for the HMF (1) to BHMF (2) conversion. In oneaspect, the solvent for the HMF (1) to BHMF (2) conversion is the sameas the solvent for the BHMF (2) to BHMTHF (3) conversion, and thesolvent for the BHMF (2) to BHMTHF (3) conversion is different from thesolvent for the BHMTHF (3) to HTO (4) conversion. In one aspect, thesolvent for the HMF (1) to BHMF (2) conversion is different from thesolvent for the BHMF (2) to BHMTHF (3) conversion, and the solvent forthe BHMF (2) to BHMTHF (3) conversion is different from the solvent forthe BHMTHF (3) to HTO (4) conversion, and the solvent for the BHMTHF (3)to HTO (4) conversion is different from the solvent for the HMF (1) toBHMF (2) conversion. When, for example, the solvent for a conversion isan organic solvent and the solvent for the subsequent conversion is anaqueous solvent, a solvent transition or exchange using an evaporativemethod, e.g., distillation, or a membrane separation method iscontemplated. For example, the solvents for the HMF (1) to BHMF (2)conversion and the BHMF (2) to BHMTHF (3) conversion may be the same ordifferent organic solvents and the solvent for the BHMTHF (3) to HTO (4)conversion may be an aqueous solvent. When the solvent for a conversionis an organic solvent and the solvent for the subsequent conversion isan aqueous solvent, the organic solvent may contain water, for example,less than 50 or 40 or 30 or 20 or 15 weight %, and the aqueous solventmay contain organic solvent, for example, less than 30 or 25 or 20 or 15weight %. When the solvent for a conversion is an organic solvent andthe solvent for the subsequent conversion is an aqueous solvent, theorganic solvent may be substantially free of water and/or the aqueoussolvent may be substantially free of organic solvent.

In some variations, at least one of the conversion of HMF (1) to BHMF(2), the conversion of BHMF (2) to BHMTHF (3), and the conversion ofBHMTHF (3) to HTO (4) is carried out in an organic solvent comprisingless than about 25 weight % water. In some variations, the conversion ofHMF (1) to BHMF (2), the conversion of BHMF (2) to BHMTHF (3), and theconversion of BHMTHF (3) to HTO (4) are each carried out in an organicsolvent comprising less than about 25 weight % water. In one variation,all three conversions are carried out in the presence of dioxane. Inanother variation, all three conversions are carried out in the presenceof isopropanol. In yet another variation, all three conversions arecarried out in the presence of glyme.

In some variations, the conversion of HMF (1) to BHMF (2) is carried outin the presence of a heterogeneous reduction catalyst comprising Cu, theconversion of BHMF (2) to BHMTHF (3) is carried out in the presence of aheterogeneous reduction catalyst comprising Ni, and the conversion ofBHMTHF (3) to HTO (4) is carried out in the presence of a heterogeneousreduction catalyst comprising Pt and optionally tungsten.

The catalyst composition for the HMF (1) to BHMF (2) conversion may bethe same as or different from the catalyst composition for the BHMF (2)to BHMTHF (3) conversion, which catalyst composition may be the same asor different from the catalyst composition for the BHMTHF (3) to HTO (4)conversion. In one aspect, the catalyst composition for the HMF (1) toBHMF (2) conversion is the same as the catalyst composition for the BHMF(2) to BHMTHF (3) conversion, which is the same as the catalystcomposition for the BHMTHF (3) to HTO (4) conversion. In one aspect, thecatalyst composition for the HMF (1) to BHMF (2) conversion is differentfrom the catalyst composition for the BHMF (2) to BHMTHF (3) conversion,and the catalyst composition for the BHMF (2) to BHMTHF (3) conversionis the same as the catalyst composition for the BHMTHF (3) to HTO (4)conversion. In one aspect, the catalyst composition for the HMF (1) toBHMF (2) conversion is different from the catalyst composition for theBHMF (2) to BHMTHF (3) conversion, and the catalyst composition for theBHMTHF (3) to HTO (4) conversion is the same as the catalyst compositionfor the HMF (1) to BHMF (2) conversion. In one aspect, the catalystcomposition for the HMF (1) to BHMF (2) conversion is the same as thecatalyst composition for the BHMF (2) to BHMTHF (3) conversion, and thecatalyst composition for the BHMF (2) to BHMTHF (3) conversion isdifferent from the catalyst composition for the BHMTHF (3) to HTO (4)conversion. In one aspect, the catalyst composition for the HMF (1) toBHMF (2) conversion is different from the catalyst composition for theBHMF (2) to BHMTHF (3) conversion, and the catalyst composition for theBHMF (2) to BHMTHF (3) conversion is different from the catalystcomposition for the BHMTHF (3) to HTO (4) conversion, and the catalystcomposition for the BHMTHF (3) to HTO (4) is different from the catalystcomposition for the HMF (1) to BHMF (2) conversion.

In some embodiments, catalysts such as Pt—W are useful in theconsecutive conversion of HMF to BHMF to BHMTHF to HTO.

The catalyst support for the HMF (1) to BHMF (2) conversion may be thesame as or different from the catalyst support for the BHMF (2) toBHMTHF (3) conversion, which catalyst support may be the same as ordifferent from the catalyst support for the BHMTHF (3) to HTO (4)conversion. In one aspect, the catalyst support for the HMF (1) to BHMF(2) conversion is the same as the catalyst support for the BHMF (2) toBHMTHF (3) conversion, which is the same as the catalyst support for theBHMTHF (3) to HTO (4) conversion. In one aspect, the catalyst supportfor the HMF (1) to BHMF (2) conversion is different from the catalystsupport for the BHMF (2) to BHMTHF (3) conversion, and the catalystsupport for the BHMF (2) to BHMTHF (3) conversion is the same as thecatalyst support for the BHMTHF (3) to HTO (4) conversion. In oneaspect, the catalyst support for the HMF (1) to BHMF (2) conversion isdifferent from the catalyst support for the BHMF (2) to BHMTHF (3)conversion, and the catalyst support for the BHMTHF (3) to HTO (4)conversion is the same as the catalyst support for the HMF (1) to BHMF(2) conversion. In one aspect, the catalyst support for the HMF (1) toBHMF (2) conversion is the same as the catalyst support for the BHMF (2)to BHMTHF (3) conversion, and the catalyst support for the BHMF (2) toBHMTHF (3) conversion is different from the catalyst support for theBHMTHF (3) to HTO (4) conversion. In one aspect, the catalyst supportfor the HMF (1) to BHMF (2) conversion is different from the catalystsupport for the BHMF (2) to BHMTHF (3) conversion, and the catalystsupport for the BHMF (2) to BHMTHF (3) conversion is different from thecatalyst support for the BHMTHF (3) to HTO (4) conversion, and thecatalyst support for the BHMTHF (3) to HTO (4) is different from thecatalyst support for the HMF (1) to BHMF (2) conversion.

Suitable conditions (e.g., reaction temperature, hydrogen pressure, flowrate) for the conversion of HMF (1) to BHMF (2), the conversion of BHMF(2) to BHMTHF (3) and the conversion of BHMTHF (3) to HTO (4) are asdescribed above. The conditions for the HMF (1) to BHMF (2) conversionmay be the same as or different from the conditions for the BHMF (2) toBHMTHF (3) conversion, which conditions may be the same as or differentfrom the conditions for the BHMTHF (3) to HTO (4) conversion. In someembodiments the conditions for each conversion are the same. In otherembodiments the conditions for each conversion are different. In someembodiments, the conditions for the HMF (1) to BHMF (2) conversion aredifferent from the conditions for the BHMF (2) to BHMTHF (3) conversion,and the conditions for the BHMF (2) to BHMTHF (3) conversion are thesame as the conditions for the BHMTHF (3) to HTO (4) conversion. Inother embodiments, the conditions for the HMF (1) to BHMF (2) conversionare the same as the conditions for the BHMF (2) to BHMTHF (3)conversion, and the conditions for the BHMF (2) to BHMTHF (3) conversionare different from the conditions for the BHMTHF (3) to HTO (4)conversion.

In one embodiment, the consecutive conversion of HMF (1) to BHMF (2) toBHMTHF (3) to HTO (4) is conducted using a guard column and a singlecatalyst in a single reactor with two temperature zones. In anotherembodiment, the consecutive conversion of HMF (1) to BHMF (2) to BHMTHF(3) to HTO (4) is conducted using a guard column and a single catalystin a single reactor with a single temperature zone. In anotherembodiment, the consecutive conversion of HMF (1) to BHMF (2) to BHMTHF(3) to HTO (4) is conducted using a guard column and two catalysts in atwo reactors arranged in sequence, and the temperatures of the tworeactors are the same or different. In still another embodiment, theconsecutive conversion of HMF (1) to BHMF (2) to BHMTHF (3) to HTO (4)is conducted using a guard column and two catalysts in a single reactor(e.g., one catalyst per reactor where the catalysts are different fromeach other) with a single temperature zone or two temperature zones.

In one variation, the consecutive conversion of HMF (1) to BHMF (2) toBHMTHF (3) is conducted in a first continuous flow reactor, and theconsecutive conversion of BHMTHF (3) to HTO (4) and optionally to HDO(5) is conducted in a second continuous flow reactor. In anothervariation, the consecutive conversion of HMF (1) to BHMF (2) to BHMTHF(3) is conducted in a first reaction zone within a continuous flowreactor, and the consecutive conversion of BHMTHF (3) to HTO (4) andoptionally to HDO (5) is conducted in a second reaction zone. In afurther variation, the consecutive conversion of HMF (1) to BHMF (2) toHTO (4) is conducted within multiple reaction zones within a firstcontinuous flow reactor, and the conversion of HTO (4) to HDO (5) isconducted in a second continuous flow reactor. In some such variations,the first and second reaction zones are contained within the samecontinuous flow reactor. In some variations, the temperature is higherin the second continuous flow reactor or second reaction zone relativeto the temperature in the first continuous flow reactor or firstreaction zone. In some variations, the pressure is higher in the secondcontinuous flow reactor or second reaction zone relative to the pressurein the first continuous flow reactor or first reaction zone. In somevariations, the reactor effluent stream from the first continuous flowreactor is fed into the second continuous flow reactor without isolationor purification of the BHMTHF (3). In one variation, the consecutiveconversion of HMF (1) to BHMF (2) to BHMTHF (3) in the first continuousflow reactor is carried out in the presence of a heterogeneous reductioncatalyst comprising at least one metal selected from the groupconsisting of Co, Mn, Ni, and Cu or a combination thereof. In anothervariation, the consecutive conversion of BHMTHF (3) to HTO (4) andoptionally to HDO (5) in the second continuous flow reactor is carriedout in the presence of a heterogeneous reduction catalyst comprising Ptand optionally tungsten.

In one aspect, HTO can be formed from the consecutive conversion of HMFto BHMF to BHMTHF to HTO over an on-stream period of at least 150 hours.In some embodiments, HTO is formed from the consecutive conversion ofHMF to BHMF to BHMTHF to HTO over an on-stream period of at least 300hours. In further embodiments, HTO is formed from the consecutiveconversion of HMF to BHMF to BHMTHF to HTO over an on-stream period ofat least about any of 500, 1,000, 2,000, 3,000, 5,000, 8,000 and 10,000hours or more. In one aspect, HTO is formed from the consecutiveconversion of HMF to BHMF to BHMTHF to HTO over an on-stream period ofat least a value provided herein but less than 15,000 or 12,000 or10,000 hours. In one aspect, HTO is formed from the consecutiveconversion of HMF to BHMF to BHMTHF to HTO over an on-stream period ofbetween about any of 150-10,000, 500-10,000, 1,000-10,000, 5,000-10,000,150-8,000, 300-5,000, 500-3,000, 1,000-8,000, 3,000-8,000, and5,000-7,000 hours. For any of the time periods described for which HMFis fed to the continuous flow reactor, in one variation, the embodimentfurther comprises (i) maintaining catalyst selectivity of at least about90%, 95%, or 99% over such time period or (ii) producing HTO in a yieldof at least about 85%, 90%, 95%, or 99% over such period; or both (i)and (ii).

Also provided is a reactor effluent stream or reactor zone effluentstream comprising HTO (4) produced by the consecutive conversion of HMF(1) to BHMF (2) to BHMTHF (3) to HTO (4) as detailed herein. In aparticular aspect, the reactor effluent stream or reactor zone effluentstream contains no more than 10 weight % or 5 weight % or issubstantially free of water. In another variation, the reactor effluentstream or reactor zone effluent stream comprising HTO also compriseswater, e.g., when water is used as a solvent in the conversion thatproduces HTO.

In one variation, the consecutive conversion of HMF (1) to BHMF (2) toBHMTHF (3) to HTO (4) employs the use of a guard bed by feeding HMFthrough a guard bed comprising a transition metal to a continuous flowreactor. Alternatively or in addition, in another variation, theconsecutive conversion of HMF (1) to BHMF (2) to BHMTHF (3) to HTO (4)employs HMF as a feedstock at about or greater than about any of 5, 6,10, 12 or 15 weight percent or more. Alternatively or in addition, inanother variation, the consecutive conversion of HMF (1) to BHMF (2) toBHMTHF (3) to HTO (4) employs a continuous flow reactor. In somevariations, the consecutive conversion of HMF (1) to BHMF (2) to BHMTHF(3) to HTO (4) is carried out on a commercial scale.

In some embodiments the consecutive conversion of HMF (1) produces amixture of HTO (4) and HDO (5).

Conversion of BHMF (2) to HTO (4)

Solvents, such as water, alcohols, esters, ethers and mixtures thereof,are suitable for the conversion of BHMF to HTO. Exemplary alcoholsinclude ethanol, n-propanol, isopropanol, n-butanol, t-butanol,iso-butanol and sec-butanol. Exemplary esters include methyl acetate,ethyl acetate, propyl acetate and butyl acetate. Exemplary ethersinclude dioxane, dioxolane, glyme, diglyme, triglyme and tetraglyme. Inone embodiment, the solvent is an organic solvent that contains lessthan about 25 weight % water. In another embodiment, the organic solventcontains less than about 10 weight % water. In another embodiment, theorganic solvent contains less than about 5 weight % water. In anotherembodiment, the organic solvent is substantially free of water. Inanother embodiment, the organic solvent contains water. In oneembodiment, an organic solvent contains up to about 50 weight % water.In another embodiment an organic solvent contains up to about 25 weight% water or up to about 10 weight % water. In one embodiment, the organicsolvent contains between about 5 and 25 weight % water, between about 15and 25 weight % water, or between about 10 and 20 weight % water. In oneembodiment, the organic solvent is an azeotropic mixture comprisingwater. In one embodiment, the organic solvent is dioxane that containsbetween about 10 and 20 weight % water. In one embodiment, the organicsolvent is isopropanol that contains between about 10 and 20 weight %water. In one embodiment, the organic solvent is glyme that containsbetween about 10 and 20 weight % water.

The conversion of BHMF (2) to HTO (4) may be carried out underconditions in which less than 50 weight % water is present. In oneembodiment, the conversion of BHMF to HTO is carried out underconditions in which less than 25 weight % water is present. In anotherembodiment, the conversion of BHMF to HTO is carried out underconditions in which less than 20 weight % water is present. In anotherembodiment, the conversion of BHMF to HTO is carried out underconditions in which less than 10 weight % water is present. In anotherembodiment, the conversion of BHMF to HTO is carried out underconditions in which less than 5 weight % water is present.

Suitable heterogeneous reduction catalysts for the conversion of BHMF toHTO are those that contain at least one metal selected from Co, Cu, Ptand Pd or a combination thereof. In one embodiment, the heterogeneousreduction catalyst contains at least one metal selected from Co and Cu.An exemplary metal combination is Co—Cu. In another embodiment, theheterogeneous reduction catalyst contains at least one metal selectedfrom Co and Cu and the loading is about 0.5 weight % to about 99 weight% (e.g., bulk use). In another embodiment, the heterogeneous reductioncatalyst contains at least one metal selected from Co and Cu and theloading is about 0.01 weight % to about 15 weight %, or about 0.1 weight% to about 10 weight %. For a bimetallic catalyst, the molar ratio ofmetal 1 to metal 2 (M1:M2) may vary from about 25:1 to about 1:25 orfrom about 25:1 to about 2:1 or from about 20:1 to about 5:1.

The heterogeneous reduction catalyst may be modified with one or moremetals. Suitable modifiers include Mn, Co, Au, W, Cu, Zn, Mo, Sb, Bi,Pb, La, Sm, Y and Re. Exemplary modified catalysts include modified Pt,Co and Cu catalysts such as Pt(Cu), Co(Cu) and Pt(Co—Cu). In oneembodiment, the molar ratio of catalyst to modifier (catalyst:modifier)is about 200:1 to about 1:10, or about 100:1 to about 1:2, or about 50:1to about 1:1.

The heterogeneous reduction catalyst may be supported. Suitable catalystsupports include carbons, aluminas, zirconias, silicas, alumina-silicas,titanias, alumina-titanias, silicon carbides and mixed phases thereof.The catalyst supports may occur in a variety of shapes, for example,extruded shapes, spheres, beads, cylinders, pellets, tablets,multi-lobed shapes, rings, stars, ripped cylinders, triholes, alphas,wheels, and the like.

In one embodiment, the temperature range for the reaction of BHMF withhydrogen is about 50° C. to about 180° C. In another embodiment, thereaction temperature is about 80° C. to about 180° C.

In one embodiment, the hydrogen pressure for the reaction of BHMF withhydrogen is about 50 psi to about 2000 psi. In another embodiment, thehydrogen pressure is about 100 psi to about 1500 psi. In still anotherembodiment, the hydrogen pressure is about 200 psi to about 1000 psi.

In one aspect, HTO is formed from BHMF over an on-stream period of atleast about 150 hours. In some embodiments, HTO is formed over anon-stream period of at least about 300 hours. In further embodiments,HTO is formed from BHMF over an on-stream period of at least about anyof 500, 1,000, 2,000, 3,000, 5,000, 8,000 and 10,000 hours or more. Inone aspect, HTO is formed from BHMF over an on-stream period of at leasta value provided herein, but less than 30,000 or 15,000 or 12,000 or10,000 hours. In one aspect, HTO is formed from BHMF over an on-streamperiod of between about any of 150-10,000, 500-10,000, 1,000-10,000,5,000-10,000, 150-8,000, 300-5,000, 500-3,000, 1,000-8,000, 3,000-8,000,and 5,000-7,000 hours. For any of the time periods described for whichBHMF is fed to the continuous flow reactor, in one variation, theembodiment further comprises (i) maintaining catalyst selectivity of atleast about 90%, 95%, or 99% over such time period or (ii) producing HTOin a yield of at least about 85%, 90%, 95%, or 99% over such period; orboth (i) and (ii).

HTO in one aspect is formed from BHMF with at least about 60%selectivity. In some embodiments, HTO is formed from BHMF with at leastabout 70% selectivity. In some embodiments, HTO is formed from BHMF withat least about 80% selectivity. In some embodiments, HTO is formed fromBHMF with at least about 90% selectivity. The transformation of BHMF toHTO is carried out in a continuous flow reactor by a heterogeneousreduction catalyst.

In one variation, at least 60% of BHMF is converted to HTO. In someembodiments, at least 70% BHMF is converted to HTO. In some embodiments,at least 80% BHMF is converted to HTO. In some embodiments, at least 90%BHMF is converted to HTO.

In a particular variation, the transformation of BHMF to HTO is carriedout in a continuous flow reactor by a heterogeneous reduction catalyst,forming HTO with at least about 65% or 70% or 75% or 80% or 85% or 90%or 95% selectivity and with a BHMF conversion of at least 65% or 70% or75% or 80% or 85% or 90% or 95%. In some variations, the transformationof BHMF to HTO is carried out on a commercial scale.

Also provided is a reactor effluent stream or reactor zone effluentstream comprising HTO produced by the method of converting BHMF to HTOas detailed herein. In a particular aspect, the reactor effluent streamor reactor zone effluent stream comprising HTO contains no more than 10weight % or 5 weight % or is substantially free of water. In anothervariation, the effluent stream comprising HTO further comprises water(e.g., when water is used as a solvent in the conversion of BHMF toHTO).

Consecutive Conversion of HMF (1) to BHMF (2) to HTO (4)

In one aspect, HMF is converted to BHMF and the BHMF so produced isconverted to HTO without isolating or purifying the BHMF, but ratherpassing the BHMF directly to the catalyst used for the conversion ofBHMF to HTO.

Suitable solvents and heterogeneous reduction catalysts for theconversion of HMF (1) to BHMF (2) and the conversion of BHMF (2) to HTO(4) are as described above. The solvent for the conversion of HMF (1) toBHMF (2) may be the same as or different from the solvent for theconversion of BHMF (2) to HTO (4). In one aspect, the solvent for theHMF (1) to BHMF (2) conversion is the same as the solvent for the BHMF(2) to HTO (4) conversion. In one aspect, the solvent for the HMF (1) toBHMF (2) conversion is different from the solvent for the BHMF (2) toHTO (4) conversion. When, for example, the solvent for the HMF (1) toBHMF (2) conversion is an organic solvent and the solvent for the BHMF(2) to HTO (4) conversion is an aqueous solvent, a solvent transition orexchange using an evaporative method, e.g., distillation, or a membraneseparation method is contemplated. When the solvent for the HMF (1) toBHMF (2) conversion is an organic solvent and the solvent for the BHMF(2) to HTO (4) conversion is an aqueous solvent, the organic solvent maycontain water, for example, less than 50 or 40 or 30 or 20 or 15 weight%, and the aqueous solvent may contain organic solvent, for example,less than 30 or 25 or 20 or 15 weight %. When the solvent for aconversion is an organic solvent and the solvent for the subsequentconversion is an aqueous solvent, the organic solvent may besubstantially free of water and/or the aqueous solvent may besubstantially free of organic solvent.

The catalyst composition for the HMF to BHMF conversion may be the sameas or different from the catalyst composition for the BHMF to HTOconversion. In one aspect, the catalyst composition for the HMF to BHMFconversion is the same as the catalyst composition for the conversion ofBHMF to HTO. In one aspect, the catalyst composition for the HMF to BHMFconversion is different from the catalyst composition for the conversionof BHMF to HTO. Similarly, the catalyst support for the HMF to BHMFconversion may be the same as or different from the catalyst support forthe BHMF to HTO conversion. In one embodiment, the catalyst support isthe same. In another embodiment, the catalyst support is different.

Suitable conditions (e.g., reaction temperature, hydrogen pressure, flowrate) for the conversion of HMF to BHMF and the conversion of BHMF toHTO are as described above. The process conditions for the HMF to BHMFconversion may be the same as or different from the process conditionsfor the BHMF to HTO conversion. In some embodiments the processconditions are the same. In other embodiments the process conditions aredifferent. In some embodiments, the temperature of the BHMF to HTOconversion is different from the temperature of the HMF to BHMFconversion. In one embodiment, the temperature of the BHMF to HTOconversion is higher than the temperature of the HMF to BHMF conversion.

In one embodiment, the temperature of the HMF to BHMF conversion isabout 70° C. to about 120° C. or about 70° C. to about 100° C. In oneembodiment, the temperature of the BHMF to HTO conversion is about 50°C. to about 180° C. or about 80° C. to about 180° C. or about 80° C. toabout 130° C.

In one embodiment, the hydrogen pressure for the reaction of BHMF withhydrogen is about 50 psi to about 2000 psi. In another embodiment, thehydrogen pressure is about 100 psi to about 1500 psi. In still anotherembodiment, the hydrogen pressure is about 200 psi to about 1000 psi.

In one embodiment, the consecutive conversion of HMF to BHMF to HTO isconducted using a guard column and a single catalyst in a single reactorwith two temperature zones. In another embodiment, the consecutiveconversion of HMF to BHMF to HTO is conducted using a guard column and asingle catalyst in a single reactor with a single temperature zone. Inanother embodiment, the consecutive conversion of HMF to BHMF to HTO isconducted using a guard column and two catalysts in two reactorsarranged in sequence (e.g., one catalyst per reactor where the catalystsare different from each other), and the temperatures of the two reactorsare the same or different. In another embodiment, the consecutiveconversion of HMF to BHMF to HTO is conducted using a guard column andtwo catalysts in a single reactor with a single temperature zone or twotemperature zones (e.g., one catalyst per temperature zone, where thecatalysts are different from each other).

In one aspect, HTO is formed from BHMF with at least about 60%selectivity. In some embodiments, HTO is formed with at least about 70%selectivity. In some embodiments, HTO is formed with at least about 80%selectivity. In some embodiments, HTO is formed from with at least about90% selectivity.

In one aspect, at least 60% of HMF can be converted to HTO. In someembodiments, at least 70% HMF can be converted to HTO. In someembodiments, at least 80% HMF is converted to HTO. In some embodiments,at least 90% HMF is converted to HTO

In one aspect, HTO is formed from the consecutive conversion of HMF toBHMF to HTO over an on-stream period of at least 150 hours. In someembodiments, HTO is formed from the consecutive conversion of HMF toBHMF to HTO over an on-stream period of at least 300 hours. In furtherembodiments, HTO is formed from the consecutive conversion of HMF toBHMF to HTO over an on-stream period of at least about any of 500,1,000, 2,000, 3,000, 5,000, 8,000 and 10,000 hours or more. In oneaspect, HTO is formed from the consecutive conversion of HMF to BHMF toHTO over an on-stream period of at least a value provided herein butless than 15,000 or 12,000 or 10,000 hours. In one aspect, HTO is formedfrom the consecutive conversion of HMF to BHMF to HTO over an on-streamperiod of between about any of 150-10,000, 500-10,000, 1,000-10,000,5,000-10,000, 150-8,000, 300-5,000, 500-3,000, 1,000-8,000, 3,000-8,000,and 5,000-7,000 hours. For any of the time periods described for whichHMF is fed to the continuous flow reactor, in one variation, theembodiment further comprises (i) maintaining catalyst selectivity of atleast about 90%, 95%, or 99% over such time period or (ii) producing HTOin a yield of at least about 85%, 90%, 95%, or 99% over such period; orboth (i) and (ii).

HTO in one aspect is formed from the consecutive conversion of HMF toBHMF to HTO with at least about 60% selectivity at each step in theconversion. In some embodiments, HTO is formed from the consecutiveconversion of HMF to BHMF to HTO with at least about 70% selectivity ateach step in the conversion. In some embodiments, HTO is formed from theconsecutive conversion of HMF to BHMF to HTO with at least about 80%selectivity at each step in the conversion. In some embodiments, HTO isformed from the consecutive conversion of HMF to BHMF to HTO with atleast about 90% selectivity at each step in the conversion. Theconsecutive conversion of HMF to BHMF to HTO is carried out in acontinuous flow reactor by a heterogeneous reduction catalyst.

In one variation, HTO is produced with a conversion of at least 85% ateach step of the consecutive conversion of HMF to BHMF to HTO. In someembodiments, HTO is produced with a conversion of at least 90% at eachstep of the consecutive conversion of HMF to BHMF to HTO. In someembodiments, HTO is produced with a conversion of at least 95% at eachstep of the consecutive conversion of HMF to BHMF to HTO. In someembodiments, HTO is produced with a conversion of at least 99% at eachstep of the consecutive conversion of HMF to BHMF to HTO.

In a particular variation, the consecutive conversion of HMF to BHMF toHTO is carried out in a continuous flow reactor by a heterogeneousreduction catalyst, forming HTO with at least about 60% or 65% or 70% or75% or 80% or 85% or 90% or 95% selectivity and with a conversion of atleast 60% or 65% or 70% or 75% or 80% or 85% or 90% or 95% at each stepof the consecutive conversion of HMF to BHMF to HTO. In some variations,the consecutive conversion of HMF to BHMF to HTO is carried out on acommercial scale.

Also provided is a reactor effluent stream or reactor zone effluentstream comprising HTO produced by the consecutive conversion of HMF toBHMF to HTO, as detailed herein. In a particular aspect, the reactoreffluent stream or reactor zone effluent stream comprising HTO containsno more than 10 weight % or 5 weight % or is substantially free ofwater. In another variation, the effluent stream comprising HTO furthercomprises water (e.g., when water is used as a solvent in the conversionof BHMF to HTO).

In one variation, the consecutive conversion of HMF to BHMF to HTOemploys the use of a guard bed by feeding HMF through a guard bedcomprising a transition metal to a continuous flow reactor.Alternatively or in addition, in another variation, the consecutiveconversion of HMF to BHMF to HTO employs HMF as a feedstock at about orgreater than about any of 5, 6, 10, 12 or 15 weight percent or more.

Liquid Phase Production of HDO (5) from HTO (4)

Aqueous solvents, organic solvents, and mixtures thereof are useful inthe conversion of HTO (4) to HDO (5). In some variations, the solvent isan aqueous solvent. In some variations, the solvent is an organicsolvent. In some variations the solvent is 100% water. In somevariations, the solvent is a mixture of water and organic solvent.Suitable solvents include water, alcohols, esters, ethers, ketones, andmixtures thereof. Exemplary alcohols include ethanol, n-propanol,isopropanol, n-butanol, t-butanol, iso-butanol and sec-butanol.Exemplary esters include methyl acetate, ethyl acetate, propyl acetateand butyl acetate. Exemplary ethers include dioxane, dioxolane, glyme,diglyme, triglyme and tetraglyme. In one embodiment, the solvent is anorganic solvent that contains less than about 25 weight % water. Inanother embodiment, the organic solvent contains less than about 10weight % water. In another embodiment, the organic solvent contains lessthan about 5 weight % water. In another embodiment, the organic solventis substantially free of water. In another embodiment, the organicsolvent contains water. In one embodiment, an organic solvent containsup to about 50 weight % water. In another embodiment an organic solventcontains up to about 25 weight % water or up to about 10 weight % water.In one embodiment, the organic solvent contains between about 5 and 25weight % water, between about 15 and 25 weight % water, or between about10 and 20 weight % water. In one embodiment, the organic solvent is anazeotropic mixture comprising water. In one embodiment, the organicsolvent is dioxane that contains between about 10 and 20 weight % water.In one embodiment, the organic solvent is isopropanol that containsbetween about 10 and 20 weight % water. In one embodiment, the organicsolvent is glyme that contains between about 10 and 20 weight % water.In one embodiment, the solvent is water.

The conversion of HTO (4) to HDO (5) may be carried out under conditionsin which less than 50 weight % water is present. In one embodiment, theconversion of HTO to HDO is carried out under conditions in which lessthan 25 weight % water is present. In another embodiment, the conversionof HTO to HDO is carried out under conditions in which less than 20weight % water is present. In another embodiment, the conversion of HTOto HDO is carried out under conditions in which less than 10 weight %water is present. In another embodiment, the conversion of HTO to HDO iscarried out under conditions in which less than 5 weight % water ispresent.

Suitable heterogeneous reduction catalysts for the conversion of HTO (4)to HDO (5) include those that comprise Pt alone or in combinations withother metals and/or alloys. In some embodiments, the catalysts comprisePt and at least one metal selected from the group consisting of Cu, Co,Mo, La, Sm, Y, W, and Re (M2). In other embodiments, one or more otherd-block metals, one or more rare earth metals (e.g., lanthanides),and/or one or more main group metals (e.g., Al) are present incombination with the Pt and M2 combinations. Typically, the total weightof metal(s) is from about 0.1% to about 10%, or from 0.2% to 10%, orfrom about 0.2% to about 8%, or from about 0.2% to about 5%, of thetotal weight of the catalyst. In some embodiments the total weight ofmetal of the catalyst is less than about 4%.

The molar ratio of Pt (M1) to (M2) may vary, for example, from about20:1 to about 1:10. In some embodiments, the M1:M2 molar ratio is in therange of from about 10:1 to about 1:5. In other embodiments, the ratioof M1:M2 is in the range of about 8:1 to about 1:2.

The heterogeneous reduction catalyst in one aspect is a supportedheterogeneous catalyst, wherein the catalyst is on the surface of thesupport. Suitable catalyst supports include, for example, acidicion-exchange resin, gamma alumina, fluorinated alumina, sulfate ortungstate promoted zirconia, titania, silica, silica promoted alumina,aluminum phosphate, tungsten oxide supported on silica-alumina, acidicclay, supported mineral acid, and zeolites. The support materials may bemodified using methods known in the art such as heat treatment, acidtreatment or by the introduction of a dopant (for example, metal-dopedtitanias, metal-doped zirconias (e.g., tungstated-zirconia), metal-dopedcerias, and metal-modified niobias). In one embodiment, supports includezirconias, silicas, and zeolites. When a catalyst support is used, themetals may be deposited using procedures known in the art including, butnot limited to incipient wetness, ion-exchange,deposition-precipitation, and vacuum impregnation. When two or moremetals are deposited on the same support, they may be depositedsequentially or simultaneously. In various embodiments, following metaldeposition, the catalyst is dried at a temperature in the range of about20° C. to about 120° C. for a period of time ranging from at least about1 hour to about 24 hours. In these and other embodiments, the catalystis dried under sub-atmospheric pressure conditions. In variousembodiments, the catalyst is reduced after drying (e.g., by flowing 5%H₂ in N₂ at a temperature of at least about 200° C. for a period of time(e.g., at least about 3 hours)). Still further, in these and otherembodiments, the catalyst is calcined in air at a temperature of atleast about 200° C. for a period of time of at least about 3 hours.

In one embodiment, the temperature range for the reaction of HTO withhydrogen is about 80° C. to about 200° C. In another embodiment, thereaction temperature is about 120° C. to about 180° C. In oneembodiment, the hydrogen pressure for the reaction of HTO with hydrogenis about 200 psi to about 2000 psi. In another embodiment, the hydrogenpressure is about 500 psi to about 2000 psi.

The conversion of HTO (4) to HDO (5) may yield a mixture of products.For example, the reaction product mixture may include not only 1,6-hexanediol and/or 1,2,6-hexanetriol, but also lesser amounts of1,5-hexanediol; 1,2-hexanediol; 1-hexanol; and 2-hexanol. In someembodiments, at least 50%, at least 60%, or at least 70% of the productmixture is 1,2,6-hexanetriol. In some embodiments, the production of HDOis at least about 40%, at least about 50% or at least about 60%.

In some variations, the conversion of HTO (4) to HDO (5) is carried outon a commercial scale.

Also provided is a reactor effluent stream or reactor zone effluentstream comprising HDO produced by the method of converting HTO to HDO asdetailed herein. In a particular aspect, the HTO used in thetransformation to HDO is obtained from any the reactions detailed hereinfor producing HTO.

Continuous Conversion System

Provided herein is a continuous conversion system for producing areaction product. The continuous conversion system may include two ormore contained areas, in each of which a reactant can undergo areduction reaction in the presence of hydrogen and a heterogeneouscatalyst. The two or more contained areas may be contained within one ormore continuous flow reactors. In some variations, the two or morecontained areas are contained within a single continuous flow reactor.In other variations, the two or more contained areas are containedwithin two or more continuous flow reactors. In another variation, eachof the two or more contained areas is contained within a separatecontinuous flow reactor. The two or more contained areas may bedifferent reaction zones within one or more continuous flow reactors. Insome variations, the continuous conversion system includes 2, 3, 4, 5,or 6 contained areas.

The two or more contained areas may be sequentially coupled such thatreactant for each successive reduction reaction is the product of theprevious reduction reaction. In some variations, the two or morecontained areas are sequentially coupled such that the reactor effluentstream or reactor zone effluent stream from each contained area is fedinto the next successive contained area without isolation orpurification of reaction products from the reactor effluent stream orreactor zone effluent stream.

In some variations, each of the contained areas is suitable forreduction of a reactant in the presence of hydrogen and a heterogeneousreduction catalyst. In some variations, each of the contained areas issuitable for carrying out one or more of the conversion processesdescribed herein. In some variations, each of the contained areas issuitable for carrying out one or more of the conversion processesdescribed herein under reaction conditions described herein (e.g.,pressure, temperature, flow rate, solvent). In one variation, thecontinuous conversion system includes a contained area suitable forconversion of HMF (1) to BHMF (2). In another variation, the continuousconversion system includes a contained area suitable for conversion ofBHMF (2) to BHMTHF (3). In another variation, the continuous conversionsystem includes a contained area suitable for conversion of BHMTHF (3)to HTO (4). In another variation, the continuous conversion systemincludes a contained area suitable for conversion of BHMF (2) to HTO(4).

The continuous conversion system may include two or more contained areassuitable for carrying out two or more of the conversions describedherein in sequence. In one variation, the continuous conversion systemincludes a first contained area suitable for conversion of HMF (1) toBHMF (2) and a second contained area suitable for conversion of BHMF (2)to BHMTHF (3). In another variation, the continuous conversion systemincludes a first contained area suitable for conversion of HMF (1) toBHMF (2), a second contained area suitable for conversion of BHMF (2) toBHMTHF (3), and a third contained area suitable for conversion of BHMTHF(3) to HTO (4). In another variation, the continuous conversion systemincludes a first contained area suitable for conversion of HMF (1) toBHMF (2) and a second contained area suitable for conversion of BHMF (2)to HTO (4). In another variation, the continuous conversion systemincludes a first contained area suitable for conversion of BHMF (2) toBHMTHF (3) and a second contained area suitable for conversion of BHMTHF(3) to HTO (4).

Each contained area may include any of the heterogeneous reductioncatalysts described herein. In one embodiment, the continuous conversionsystem includes two contained areas, wherein the first contained areacontains a heterogeneous reduction catalyst comprising Cu and the secondcontained area contains a heterogeneous reduction catalyst comprisingNi. In another embodiment, the continuous conversion system includes twocontained areas, wherein the first contained area contains aheterogeneous reduction catalyst comprising Ni and the second containedarea contains a heterogeneous reduction catalyst comprising Pt. Inanother embodiment, the continuous conversion system includes threecontained areas, wherein the first contained area contains aheterogeneous reduction catalyst comprising Cu, the second containedarea contains a heterogeneous reduction catalyst comprising Ni, and thethird contained area contains a heterogeneous reduction catalystcomprising Pt. In some embodiments, the heterogeneous reduction catalystcomprising Cu exhibits at least about 85%, 90%, 95%, or 99% selectivityfor converting a reactant to a product over an on-stream period of anyone of 150, 300, 500, 1,000, 2,000, 3,000, 5,000, 8,000, or 10,000hours. In some embodiments, the heterogeneous reduction catalystcomprising Ni exhibits at least about 85%, 90%, 95%, or 99% selectivityfor converting a reactant to a product over an on-stream period of anyone of 150, 300, 500, 1,000, 2,000, 3,000, 5,000, 8,000, or 10,000hours. In some embodiments, the heterogeneous reduction catalystcomprising Pt exhibits at least about 85%, 90%, 95%, or 99% selectivityfor converting a reactant to a product over an on-stream period of anyone of 150, 300, 500, 1,000, 2,000, 3,000, 5,000, 8,000, or 10,000hours.

The continuous conversion system may contain a guard bed comprising atransition metal, such as any of the guard beds described herein. In onevariation, the guard bed is coupled to the first contained area suchthat the first reactant can be fed through the guard bed to the firstcontained area.

All variations of each of the processes and systems described herein maybe configured for use on a commercial scale.

All variations of each of the processes and compositions describedwherein, where applicable, may be combined as if each and everycombination of variations were specifically and individually listed.

All patents, patent applications and non-patent literature cited hereinare hereby incorporated herein by reference in their entireties.

Enumerated Embodiments

The following enumerated embodiments are representative of some aspectsof the invention.

1. A process for preparing 2,5-bis-hydroxymethylfuran (BHMF) from5-hydroxymethylfurfural (HMF) comprising:

feeding 5-hydroxymethylfurfural (HMF) to a continuous flow reactor foran on-stream period of at least 150 hours; and

reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of an organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or acombination thereof to form 2,5-bis-hydroxymethylfuran (BHMF) with atleast about 90% selectivity and at least 85% 5-hydroxymethylfurfural(HMF) conversion.

2. The process of embodiment 1, wherein the 2,5-bis-hydroxymethylfuran(BHMF) is formed with at least about 90% selectivity and at least 90%5-hydroxymethylfurfural (HMF) conversion.

3. The process of embodiment 1, wherein the 2,5-bis-hydroxymethylfuran(BHMF) is formed with at least about 95% selectivity and at least 90%5-hydroxymethylfurfural (HMF) conversion.

4. The process of any one of embodiments 1-3, wherein the2,5-bis-hydroxymethylfuran (BHMF) is formed over the on-stream period ofat least 150 hours.

5. The process of any one of embodiments 1-4, wherein the organicsolvent contains less than about 25 weight % water.

6. The process of any one of embodiments 1-4, wherein the organicsolvent contains less than about 10 weight % water.

7. The process of any one of embodiments 1-4, wherein the organicsolvent is substantially free of water.

8. The process of any one of embodiments 1-7, wherein the5-hydroxymethylfurfural (HMF) is fed to the continuous flow reactorthrough a guard bed comprising a transition metal.

9. The process of embodiment 8, wherein the guard bed comprises at leastone transition metal selected from the group consisting of Ag, Zn, Cu,Fe, Ni, Co and Pb or a salt or combination thereof.

10. The process of any one of embodiments 1-9, wherein the concentrationof the 5-hydroxymethylfurfural (HMF) is greater than about 5 weightpercent in the organic solvent.

11. The process of embodiment 10, wherein the concentration of the5-hydroxymethylfurfural (HMF) is greater than about 10 weight percent inthe organic solvent.

12. A process for preparing 2,5-bis-hydroxymethylfuran (BHMF) from5-hydroxymethylfurfural (HMF) comprising:

feeding 5-hydroxymethylfurfural (HMF) through a guard bed comprising atransition metal to a continuous flow reactor; and

reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of an organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pd, Pt, Fe and Ru or acombination thereof to form 2,5-bis-hydroxymethylfuran (BHMF).

13. The process of embodiment 12, wherein the guard bed comprises atleast one transition metal selected from the group consisting of Ag, Zn,Cu, Fe, Ni, Co and Pb or a salt or combination thereof.

14. The process of embodiment 13, wherein the guard bed comprises atleast one transition metal selected from the group consisting of Ag, Zn,Cu and Pb or a salt or combination thereof.

15. The process of any one of embodiments 12-14, wherein theconcentration of the 5-hydroxymethylfurfural (HMF) is greater than about5 weight percent in the organic solvent.

16. The process of embodiment 15, wherein the concentration of the5-hydroxymethylfurfural (HMF) is greater than about 10 weight percent inthe organic solvent.

17. The process of any one of embodiments 12-16, wherein the5-hydroxymethylfurfural (HMF) is fed to the continuous flow reactor foran on-stream period of at least 150 hours.

18. The process of embodiment 17, wherein 2,5-bis-hydroxymethylfuran(BHMF) is formed over an on-stream period of at least 150 hours.

19. A process for preparing 2,5-bis-hydroxymethylfuran (BHMF) from5-hydroxymethylfurfural (HMF) comprising:

feeding 5-hydroxymethylfurfural (HMF) to a continuous flow reactor at aconcentration of greater than or equal to 6 weight percent in an organicsolvent for an on-stream period of at least 150 hours; and

reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of the organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or acombination thereof to form the 2,5-bis-hydroxymethylfuran (BHMF) overthe on-stream period of at least 150 hours.

20. The process of embodiment 19, wherein the concentration of the5-hydroxymethylfurfural (HMF) is greater than about 10 weight percent.

21. The process of embodiment 19 or 20, wherein the5-hydroxymethylfurfural (HMF) is fed to the continuous flow reactorthrough a guard bed comprising a transition metal.

22. The process of embodiment 21, wherein the guard bed comprises atleast one transition metal selected from the group consisting of Ag, Zn,Cu, Fe, Ni, Co and Pb or a salt or combination thereof.

23. The process of any one of embodiments 19-22, wherein the2,5-bis-hydroxymethylfuran (BHMF) is formed with at least about 90%selectivity and at least 85% 5-hydroxymethylfurfural (HMF) conversion.

24. The process of any one of embodiments 19-22, wherein the2,5-bis-hydroxymethylfuran (BHMF) is formed with at least about 95%selectivity and at least 90% 5-hydroxymethylfurfural (HMF) conversion.

25. The process of any one of embodiments 1-24, wherein the organicsolvent is selected from the group consisting of alcohols, esters,ethers and mixtures thereof.

26. The process of embodiment 25, wherein the organic solvent is analcohol.

27. The process of embodiment 26, wherein the alcohol is selected fromthe group consisting of ethanol, n-propanol, isopropanol, n-butanol,t-butanol, iso-butanol and sec-butanol.

28. The process of embodiment 25, wherein the organic solvent is anester.

29. The process of embodiment 28, wherein the ester is selected from thegroup consisting of methyl acetate, ethyl acetate, propyl acetate andbutyl acetate.

30. The process of embodiment 25, wherein the organic solvent is anether.

31. The process of embodiment 30, wherein the ether is selected from thegroup consisting of dioxane, dioxolane, glyme, diglyme, triglyme andtetraglyme.

32. The process of any one of embodiments 1-31, wherein theheterogeneous reduction catalyst comprises a combination of metalsselected from the group consisting of Co—Cu, Ni—Cu, Ag—Ni, Ag—Co andAg—Ru.

33. The process of any one of embodiments 1-32, wherein theheterogeneous reduction catalyst further comprises a modifier.

34. The process of embodiment 33, wherein the modifier is selected fromthe group consisting of Au, W, Cu, Zn, Mo, Sb, Bi and Pb.

35. The process of any one of embodiments 1-34, wherein theheterogeneous reduction catalyst further comprises a catalyst support.

36. The process of embodiment 35, wherein the catalyst support isselected from the group consisting of carbons, aluminas, zirconias,silicas, alumina-silicas, titanias, alumina-titanias, silicon carbidesand mixed phases thereof.

37. The process of any one of embodiments 1-36, wherein the5-hydroxymethylfurfural (HMF) is reacted with hydrogen at a temperaturein a range of about 50° C. to about 150° C. and at a pressure in a rangeof about 50 psi to about 2000 psi.

38. A process for preparing 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) from 2,5-bis-hydroxymethylfuran (BHMF) comprising:

reacting 2,5-bis-hydroxymethylfuran (BHMF) obtained from the process ofany one of claims 1-37 with hydrogen in a continuous flow reactor in thepresence of an organic solvent and a heterogeneous reduction catalystcomprising at least one metal selected from the group consisting of Ni,Co, Cu, Ag, Pd, Pt and Ru or a combination thereof to form the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF).

39. The process of embodiment 38, wherein the heterogeneous reductioncatalyst used in the reaction of 2,5-bis-hydroxymethylfuran (BHMF) withhydrogen is the same as or different from the heterogeneous reductioncatalyst used in the reaction of 5-hydroxymethylfurfural (HMF) withhydrogen.

40. The process of embodiment 38 or 39, wherein the temperature andpressure in the reaction of 2,5-bis-hydroxymethylfuran (BHMF) withhydrogen are the same as or different from the temperature and pressurein the reaction of 5-hydroxymethylfurfural (HMF) with hydrogen.

41. The process of any one of embodiments 38-40, wherein the reactorused in the reaction of 2,5-bis-hydroxymethylfuran (BHMF) with hydrogenis the same as or different from the reactor used in the reaction of5-hydroxymethylfurfural (HMF) with hydrogen.

42. A process for preparing 1,2,6-hexanetriol (HTO) from2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) comprising:

reacting 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) obtained from theprocess of any one of claims 38-41 with hydrogen in a continuous flowreactor in the presence of an aqueous or organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt and Ru or a combinationthereof to form the 1,2,6-hexanetriol (HTO).

43. The process of embodiment 42, wherein the heterogeneous reductioncatalyst used in the reaction of 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) with hydrogen is the same as or different from (i) theheterogeneous reduction catalyst used in the reaction of5-hydroxymethylfurfural (HMF) with hydrogen or (ii) the heterogeneousreduction catalyst used in the reaction of 2,5-bis-hydroxymethylfuran(BHMF) with hydrogen.

44. The process of embodiment 42 or 43, wherein the temperature andpressure in the reaction of 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) with hydrogen are the same as or different from (i) thetemperature and pressure in the reaction of 5-hydroxymethylfurfural(HMF) with hydrogen or (ii) the temperature and pressure in the reactionof 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen.

45. The process of any one of embodiments 42-44, wherein the reactorused in the reaction of 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF)with hydrogen is the same as or different from (i) the reactor used inthe reaction of 5-hydroxymethylfurfural (HMF) with hydrogen or (ii) thereactor used in the reaction of 2,5-bis-hydroxymethylfuran (BHMF) withhydrogen.

46. A process for preparing 1,2,6-hexanetriol (HTO) from2,5-bis-hydroxymethylfuran (BHMF) comprising:

reacting 2,5-bis-hydroxymethylfuran (BHMF) obtained from the process ofany one of claims 1-37 with hydrogen in a continuous flow reactor in thepresence of an aqueous or organic solvent and a heterogeneous reductioncatalyst comprising at least one metal selected from the groupconsisting of Ni, Co, Cu, Ag, Pt, Pd and Ru or a combination thereof toform the 1,2,6-hexanetriol (HTO).

47. The process of embodiment 46, wherein the 2,5-bis-hydroxymethylfuran(BHMF) is reacted with hydrogen at a temperature in a range of about 80°C. to about 180° C. and a pressure in a range of about 50 psi to about2000 psi.

48. The process of embodiment 46 or 47, wherein the heterogeneousreduction catalyst used in the reaction of 2,5-bis-hydroxymethylfuran(BHMF) with hydrogen is the same as or different from the heterogeneousreduction catalyst used in the reaction of 5-hydroxymethylfurfural (HMF)with hydrogen.

49. A process for preparing 1,6-hexanediol (HDO) from 1,2,6-hexanetriol(HTO) comprising:

reacting 1,2,6-hexanetriol (HTO) obtained from the process of any one ofclaims 42-48 with hydrogen in a continuous flow reactor in the presenceof a heterogeneous reduction catalyst comprising at least one metalselected from the group consisting of Ni, Co, Cu, Ag, Pt and Ru or acombination thereof to form 1,6-hexanediol (HDO).

50. The process of embodiment 49, wherein the 1,2,6-hexanetriol (HTO) isreacted with hydrogen in a continuous flow reactor in the presence of anaqueous or organic solvent or a mixture thereof.

51. The process of embodiment 50, wherein the organic solvent isselected from the group consisting of alcohols, esters, ethers andmixtures thereof.

52. The process of any one of embodiments 49-51, wherein theheterogeneous reduction catalyst further comprises a modifier.

53. The process of embodiment 52, wherein the modifier is selected fromthe group consisting of Au, W, Cu, Zn, Mo, Sb, Bi and Pb.

54. The process of any one of embodiments 49-53, wherein theheterogeneous reduction catalyst further comprises a catalyst support.

55. The process of embodiment 54, wherein the catalyst support isselected from the group consisting of carbons, aluminas, zirconias,silicas, alumina-silicas, titanias, alumina-titanias, silicon carbidesand mixed phases thereof.

56. The process of any one of embodiments 49-55, wherein1,2,6-hexanetriol (HTO) is reacted with hydrogen at a temperature in arange of about 80° C. to about 200° C. and at a pressure in a range ofabout 50 psi to about 2000 psi.

57. A process for preparing 1,2,6-hexanetriol (HTO) from5-hydroxymethylfurfural (HMF) comprising:

feeding 5-hydroxymethylfurfural (HMF) to a continuous flow reactor at aconcentration of greater than about 5 weight percent in an organicsolvent;

reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of the organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or acombination thereof to form 2,5-bis-hydroxymethylfuran (BHMF) in a firstreactor effluent stream or a first reactor zone effluent stream;

reacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen, withoutisolation or purification of the 2,5-bis-hydroxymethylfuran (BHMF) fromthe first reactor effluent stream or the first reactor zone effluentstream, in the presence of a heterogeneous reduction catalyst to form2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) in a second reactoreffluent stream or a second reactor zone effluent stream; and

reacting the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) withhydrogen, without isolation or purification of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from the second reactoreffluent stream or the second reactor zone effluent stream, in thepresence of a heterogeneous reduction catalyst to form 1,2,6-hexanetriol(HTO).

58. The process of embodiment 57, wherein the reaction of2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen is carriedout in the presence of an aqueous solvent and a heterogeneous reductioncatalyst to form 1,2,6-hexanetriol (HTO).

59. A process for preparing 1,2,6-hexanetriol (HTO) from5-hydroxymethylfurfural (HMF) comprising:

feeding 5-hydroxymethylfurfural (HMF) to a continuous flow reactor at aconcentration of greater than about 5 weight percent in an organicsolvent;

reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of the organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or acombination thereof to form 2,5-bis-hydroxymethylfuran (BHMF) in a firstreactor effluent stream or a first reactor zone effluent stream; and

reacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen, withoutisolation or purification of the 2,5-bis-hydroxymethylfuran (BHMF) fromthe first reactor effluent stream or a first reactor zone effluentstream, in the presence of a heterogeneous reduction catalyst to form1,2,6-hexanetriol (HTO).

60. The process of embodiment 57 or 59, wherein the reaction of2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is carried out in thepresence of an aqueous solvent and a heterogeneous reduction catalyst toform 1,2,6-hexanetriol (HTO).

61. A process for producing any one or more of HMDA, adipic acid,caprolactam, caprolactone, a polyol, a polyester polyol, a polyester anda polyurethane comprising converting the 1,6-hexanediol (HDO) producedby any one of embodiments 49 to 56 to the one or more of HMDA, adipicacid, caprolactam, caprolactone, a polyol, a polyester polyol, apolyester and a polyurethane.

62. A process for producing any one or more of a polyol, a polyesterpolyol, a polyester and a polyurethane comprising converting the2,5-bis-hydroxymethylfuran (BHMF), 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) or 1,2,6-hexanetriol (HTO) produced by the process of any oneof embodiments 1-48 to the any one or more of a polyol, a polyesterpolyol, a polyester and a polyurethane.

63. The process of any one of embodiments 35, 36, 54 or 55, wherein thecatalyst support is a shaped support.

64. The process of embodiment 63, wherein the shape of the catalystsupport is selected from the group consisting of an extrudate, sphere,bead, cylinder, pellet, tablet, multi-lobed shape, ring, star, rippedcylinder, trihole, alpha and wheels.

65. The process of any one embodiments 1-64, wherein the heterogeneousreduction catalyst comprises at least one metal selected from the groupconsisting of Ag, Ru, Pd and Pt and total concentration of the metals isfrom at least 0.1 weight % to about 15 weight % of the total weight ofthe catalyst.

66. The process of any one of embodiments 1-64, wherein theheterogeneous reduction catalyst comprises at least one metal selectedfrom the group consisting of Ni, Cu, Co and Fe and the totalconcentration of the metals is from at least 0.5 weight % to about 40weight % of the total weight of the catalyst.

1A. A process for preparing 2,5-bis-hydroxymethylfuran (BHMF) from5-hydroxymethylfurfural (HMF) comprising:

reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in a continuousflow reactor in the presence of an organic solvent and a heterogeneousreduction catalyst comprising at least one metal selected from the groupconsisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or a combination thereofto form the 2,5-bis-hydroxymethylfuran (BHMF), wherein the processfurther comprises one or more of (i)-(iii):

(i) forming the 2,5-bis-hydroxymethylfuran (BHMF) over an on-streamperiod of at least 150 hours;

(ii) feeding the 5-hydroxymethylfurfural (HMF) through a guard bedcomprising a transition metal to the continuous flow reactor;

(iii) feeding the 5-hydroxymethylfurfural (HMF) to the continuous flowreactor for an on-stream period of at least 150 hours.

2A. The process of embodiment 1A, wherein the reaction proceeds with atleast 85% conversion of the 5-hydroxymethylfurfural (HMF).

3A. The process of any one of embodiments 1A-2A, wherein the processcomprises forming the 2,5-bis-hydroxymethylfuran (BHMF) with at leastabout 90% selectivity.

4A. The process of any one of embodiments 1A-3A, wherein (i) applies.

5A. The process of any one of embodiments 1A-4A, wherein (ii) applies.

6A. The process of embodiment 5A, wherein the guard bed comprises atleast one transition metal selected from the group consisting of Ag, Zn,Cu, Fe, Ni, Co and Pb or a salt or combination thereof.

7A. The process of embodiment 6A, wherein the guard bed comprises atleast one transition metal selected from the group consisting of Ag, Zn,Cu and Pb or a salt or combination thereof.

8A. The process of any one of embodiments 1A-7A, wherein (iii) applies.

9A. The process of any one of embodiments 1A-8A, wherein the processcomprises feeding the 5-hydroxymethylfurfural (HMF) to the continuousflow reactor at a concentration of greater than about 6 weight percentin the organic solvent.

10A. The process of any one of embodiments 1A-9A, wherein the processcomprises feeding the 5-hydroxymethylfurfural (HMF) to the continuousflow reactor at a concentration of greater than about 10 weight percentin the organic solvent.

11A. The process of any one of embodiments 1A-10A, wherein the processcomprises forming the 2,5-bis-hydroxymethylfuran (BHMF) with at leastabout 90% selectivity and at least 90% 5-hydroxymethylfurfural (HMF)conversion.

12A. The process of any one of embodiments 1A-11A, wherein the processcomprises forming the 2,5-bis-hydroxymethylfuran (BHMF) with at leastabout 95% selectivity and at least 90% 5-hydroxymethylfurfural (HMF)conversion.

13A. The process of any one of embodiments 1A-12A, wherein the organicsolvent comprises less than about 25 weight % water.

14A. The process of any one of embodiments 1A-12A, wherein the organicsolvent comprises less than about 10 weight % water.

15A. The process of any one of embodiments 1A-12A, wherein the organicsolvent is substantially free of water.

16A. The process of any one of embodiments 1A-15A, wherein the organicsolvent is selected from the group consisting of alcohols, esters,ethers and mixtures thereof.

17A. The process of embodiment 16A, wherein the organic solventcomprises an alcohol.

18A. The process of embodiment 17A, wherein the alcohol is selected fromthe group consisting of ethanol, n-propanol, isopropanol, n-butanol,t-butanol, iso-butanol and sec-butanol.

19A. The process of embodiment 16A, wherein the organic solventcomprises an ester.

20A. The process of embodiment 19A, wherein the ester is selected fromthe group consisting of methyl acetate, ethyl acetate, propyl acetateand butyl acetate.

21A. The process of embodiment 16A, wherein the organic solventcomprises an ether.

22A. The process of embodiment 21A, wherein the ether is selected fromthe group consisting of dioxane, dioxolane, glyme, diglyme, triglyme andtetraglyme.

23A. The process of any one of embodiments 1A-22A, wherein theheterogeneous reduction catalyst comprises a combination of metalsselected from the group consisting of Co—Cu, Ni—Cu, Ag—Ni, Ag—Co andAg—Ru.

24A. The process of any one of embodiments 1A-23A, wherein theheterogeneous reduction catalyst further comprises a modifier.

25A. The process of embodiment 24A, wherein the modifier is selectedfrom the group consisting of Mn, Co, Au, W, Cu, Zn, Mo, Sb, Bi and Pb.

26A. The process of any one of embodiments 1A-25A, wherein theheterogeneous reduction catalyst further comprises a catalyst support.

27A. The process of embodiment 26A, wherein the catalyst support isselected from the group consisting of carbons, aluminas, zirconias,silicas, alumina-silicas, titanias, alumina-titanias, silicon carbidesand mixed phases thereof.

28A. The process of any one of embodiments 1A-27A, wherein the5-hydroxymethylfurfural (HMF) is reacted with hydrogen at a temperaturein a range of about 50° C. to about 150° C. and at a pressure in a rangeof about 50 psi to about 2000 psi.

29A. The process of any one of embodiments 1A-28A, further comprisingreacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen in acontinuous flow reactor in the presence of an organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pd, Pt and Ru or acombination thereof to form 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF).

30A. The process of embodiment 29A, wherein the heterogeneous reductioncatalyst used in the reaction of the 2,5-bis-hydroxymethylfuran (BHMF)with hydrogen is the same as the heterogeneous reduction catalyst usedin the reaction of the 5-hydroxymethylfurfural (HMF) with hydrogen.

31A. The process of embodiment 29A, wherein the heterogeneous reductioncatalyst used in the reaction of the 2,5-bis-hydroxymethylfuran (BHMF)with hydrogen is different from the heterogeneous reduction catalystused in the reaction of the 5-hydroxymethylfurfural (HMF) with hydrogen.

32A. The process of any one of embodiments 29A-31A, wherein thetemperature and pressure in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen are the same as thetemperature and pressure in the reaction of the 5-hydroxymethylfurfural(HMF) with hydrogen.

33A. The process of any one of embodiments 29A-31A, wherein thetemperature and pressure in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen are different from thetemperature and pressure in the reaction of the 5-hydroxymethylfurfural(HMF) with hydrogen.

34A. The process of any one of embodiments 29A-33A, wherein thecontinuous flow reactor used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is the same as thecontinuous flow reactor used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen.

35A. The process of any one of embodiments 29A-33A, wherein thecontinuous flow reactor used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is different from thecontinuous flow reactor used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen.

36A. The process of any one of embodiments 29A-35A, wherein the organicsolvent used in the reaction of the 2,5-bis-hydroxymethylfuran (BHMF)with hydrogen comprises less than about 25 weight % water.

37A. The process of any one of embodiments 29A-36A, further comprisingreacting the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogenin a continuous flow reactor in the presence of an aqueous or organicsolvent and a heterogeneous reduction catalyst comprising at least onemetal selected from the group consisting of Ni, Co, Cu, Ag, Pt and Ru ora combination thereof to form 1,2,6-hexanetriol (HTO).

38A. The process of embodiment 37A, wherein the heterogeneous reductioncatalyst used in the reaction of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen is the sameas (i) the heterogeneous reduction catalyst used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen or (ii) the heterogeneousreduction catalyst used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen.

39A. The process of embodiment 37A, wherein the heterogeneous reductioncatalyst used in the reaction of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen is differentfrom (i) the heterogeneous reduction catalyst used in the reaction ofthe 5-hydroxymethylfurfural (HMF) with hydrogen or (ii) theheterogeneous reduction catalyst used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen.

40A. The process of any one of embodiments 37A-39A, wherein thetemperature and pressure in the reaction of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen are the sameas (i) the temperature and pressure in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen or (ii) the temperature andpressure in the reaction of the 2,5-bis-hydroxymethylfuran (BHMF) withhydrogen.

41A. The process of any one of embodiments 37A-39A, wherein thetemperature and pressure in the reaction of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen aredifferent from (i) the temperature and pressure in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen or (ii) the temperature andpressure in the reaction of the 2,5-bis-hydroxymethylfuran (BHMF) withhydrogen.

42A. The process of any one of embodiments 37A-41A, wherein thecontinuous flow reactor used in the reaction of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen is the sameas (i) the continuous flow reactor used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen or (ii) the continuous flowreactor used in the reaction of the 2,5-bis-hydroxymethylfuran (BHMF)with hydrogen.

43A. The process of any one of embodiments 37A-41A, wherein thecontinuous flow reactor used in the reaction of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen is differentfrom (i) the continuous flow reactor used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen or (ii) the continuous flowreactor used in the reaction of the 2,5-bis-hydroxymethylfuran (BHMF)with hydrogen.

44A. The process of any one of embodiments 37A-43A, wherein the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) is reacted with hydrogenin the presence of an organic solvent comprising less than about 25weight % water.

45A. The process of any one of embodiments 1A-28A, further comprisingreacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen in acontinuous flow reactor at a pressure in a range of about 50 psi toabout 2000 psi in the presence of an aqueous or organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd and Ru or acombination thereof to form 1,2,6-hexanetriol (HTO).

46A. The process of embodiment 45A, wherein the2,5-bis-hydroxymethylfuran (BHMF) is reacted with hydrogen at atemperature in a range of about 80° C. to about 180° C.

47A. The process of embodiment 45A or 46A, wherein the heterogeneousreduction catalyst used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is the same as theheterogeneous reduction catalyst used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen.

48A. The process of embodiment 45A or 46A, wherein the heterogeneousreduction catalyst used in the reaction of the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen is different from theheterogeneous reduction catalyst used in the reaction of the5-hydroxymethylfurfural (HMF) with hydrogen.

49A. The process of any one of embodiments 45A-48A, wherein the2,5-bis-hydroxymethylfuran (BHMF) is reacted with hydrogen in thepresence of an organic solvent comprising less than about 25 weight %water.

50A. The process of any one of embodiments 37A-49A, further comprisingreacting the 1,2,6-hexanetriol (HTO) with hydrogen in a continuous flowreactor in the presence of a heterogeneous reduction catalyst comprisingat least one metal selected from the group consisting of Ni, Co, Cu, Ag,Pt and Ru or a combination thereof to form 1,6-hexanediol (HDO).

51A. The process of embodiment 50A, wherein the 1,2,6-hexanetriol (HTO)is reacted with hydrogen in a continuous flow reactor in the presence ofan aqueous or organic solvent or a mixture thereof.

52A. The process of embodiment 50A, wherein the wherein the1,2,6-hexanetriol (HTO) is reacted with hydrogen in a continuous flowreactor in the presence of an organic solvent comprising less than about25 weight % water.

53A. The process of embodiment 52A, wherein the organic solvent used inthe reaction of the 1,2,6-hexanetriol (HTO) with hydrogen is selectedfrom the group consisting of alcohols, esters, ethers and mixturesthereof.

54A. The process of any one of embodiments 50A-53A, wherein theheterogeneous reduction catalyst used in the reaction of the1,2,6-hexanetriol (HTO) with hydrogen further comprises a modifier.

55A. The process of embodiment 54A, wherein the modifier used in thereaction of the 1,2,6-hexanetriol (HTO) with hydrogen is selected fromthe group consisting of Mn, Co, Au, W, Cu, Zn, Mo, Sb, Bi and Pb.

56A. The process of any one of embodiments 50A-55A, wherein theheterogeneous reduction catalyst used in the reaction of the1,2,6-hexanetriol (HTO) with hydrogen further comprises a catalystsupport.

57A. The process of embodiment 56A, wherein the catalyst support used inthe reaction of the 1,2,6-hexanetriol (HTO) with hydrogen is selectedfrom the group consisting of carbons, aluminas, zirconias, silicas,alumina-silicas, titanias, alumina-titanias, silicon carbides and mixedphases thereof.

58A. The process of any one of embodiments 50A-57A, wherein the1,2,6-hexanetriol (HTO) is reacted with hydrogen at a temperature in arange of about 80° C. to about 200° C. and at a pressure in a range ofabout 50 psi to about 2000 psi.

59A. A process for preparing 1,2,6-hexanetriol (HTO) from5-hydroxymethylfurfural (HMF) comprising:

(a) feeding 5-hydroxymethylfurfural (HMF) to a continuous flow reactorat a concentration of greater than about 5 weight percent in a firstorganic solvent;

(b) reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of the first organic solvent anda first heterogeneous reduction catalyst comprising at least one metalselected from the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ruor a combination thereof to form 2,5-bis-hydroxymethylfuran (BHMF) in afirst reactor effluent stream or a first reactor zone effluent stream;

(c) reacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen,without isolation or purification of the 2,5-bis-hydroxymethylfuran(BHMF) from the first reactor effluent stream or the first reactor zoneeffluent stream, in the presence of a second heterogeneous reductioncatalyst to form 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) in asecond reactor effluent stream or a second reactor zone effluent stream;and

(d) reacting the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) withhydrogen, without isolation or purification of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from the second reactoreffluent stream or the second reactor zone effluent stream, in thepresence of a third heterogeneous reduction catalyst to form the1,2,6-hexanetriol (HTO).

60A. The process of embodiment 59A, wherein the first organic solventcomprises less than about 25 weight % water.

61A. The process of any one of embodiments 59A-60A, wherein the2,5-bis-hydroxymethylfuran (BHMF) is reacted with hydrogen in thepresence of a second organic solvent comprising less than about 25weight % water.

62A. The process of any one of embodiments 59A-61A, wherein the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) is reacted with hydrogenin the presence of a third organic solvent comprising less than about 25weight % water.

63A. The process of any one of embodiments 59A-62A, wherein the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) is reacted with hydrogenin the presence of an aqueous solvent.

64A. A process for preparing 1,2,6-hexanetriol (HTO) from5-hydroxymethylfurfural (HMF) comprising:

feeding the 5-hydroxymethylfurfural (HMF) to a continuous flow reactorat a concentration of greater than about 5 weight percent in a firstorganic solvent;

reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of the first organic solvent anda first heterogeneous reduction catalyst comprising at least one metalselected from the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ruor a combination thereof to form 2,5-bis-hydroxymethylfuran (BHMF) in afirst reactor effluent stream or a first reactor zone effluent stream;and

reacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen, withoutisolation or purification of the 2,5-bis-hydroxymethylfuran (BHMF) fromthe first reactor effluent stream or the first reactor zone effluentstream, in the presence of a second heterogeneous reduction catalyst toform the 1,2,6-hexanetriol (HTO).

65A. The process of embodiment 64A, wherein the organic solventcomprises less than about 25 weight % water.

66A. The process of any one of embodiments 64A-65A, wherein the2,5-bis-hydroxymethylfuran (BHMF) is reacted with hydrogen in thepresence of a second organic solvent comprising less than about 25weight % water.

67A. The process of any one of embodiments 64A-65A, wherein the2,5-bis-hydroxymethylfuran (BHMF) is reacted with hydrogen in thepresence of an aqueous solvent.

68A. The process of any one of embodiments 50A-58A, further comprisingconverting the 1,6-hexanediol (HDO) to one or more of HMDA, adipic acid,caprolactam, caprolactone, a polyol, a polyester polyol, a polyester anda polyurethane.

69A. The process of any one of embodiments 1A-49A, further comprisingconverting the 2,5-bis-hydroxymethylfuran (BHMF), the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) or the 1,2,6-hexanetriol(HTO) to any one or more of a polyol, a polyester polyol, a polyesterand a polyurethane.

70A. The process of any one of embodiments 26A, 27A, 56A, and 57A,wherein the catalyst support is a shaped support.

71A. The process of embodiment 70A, wherein the shape of the catalystsupport is selected from the group consisting of an extrudate, sphere,bead, cylinder, pellet, tablet, multi-lobed shape, ring, star, rippedcylinder, trihole, alpha and wheels.

72A. The process of any one embodiments 1A-71A, wherein at least one ofthe heterogeneous reduction catalysts comprises at least one metalselected from the group consisting of Ag, Ru, Pd and Pt, and the totalconcentration of the metals is from at least 0.1 weight % to about 15weight % of the total weight of the catalyst.

73A. The process of any one of embodiments 1A-71A, wherein at least oneof the heterogeneous reduction catalysts comprises at least one metalselected from the group consisting of Ni, Cu, Co and Fe, and the totalconcentration of the metals is from at least 0.5 weight % to about 40weight % of the total weight of the catalyst.

74A. A process for preparing 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF) from 2,5-bis-hydroxymethylfuran (BHMF) comprising:

reacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen in acontinuous flow reactor at a pressure in a range of about 50 psi toabout 2000 psi in the presence of:

(i) an organic solvent comprising less than about 25 weight % water, and

(ii) a heterogeneous reduction catalyst comprising at least one metalselected from the group consisting of Ni, Co, Cu, Ag, Pd, Pt and Ru or acombination thereof to form the 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF).

75A. A process for preparing 1,2,6-hexanetriol (HTO) and 1,6-hexanediol(HDO) from 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) comprising:

reacting the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogenin a continuous flow reactor at a pressure in a range of about 50 psi toabout 2000 psi in the presence of:

(i) an organic solvent comprising less than about 25 weight % water, and

(ii) a heterogeneous reduction catalyst comprising at least one metalselected from the group consisting of Ni, Co, Cu, Ag, Pt and Ru or acombination thereof

to form the 1,2,6-hexanetriol (HTO) and the 1,6-hexanediol (HDO) with atleast about 90% combined selectivity and at least 85%2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) conversion.

76A. A process for preparing 2,5-bis-hydroxymethylfuran (BHMF) from5-hydroxymethylfurfural (HMF) comprising:

reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in a continuousflow reactor at a pressure in a range of about 50 psi to about 2000 psiin the presence of

(i) an organic solvent comprising less than about 25 weight % water, and

(ii) a heterogeneous reduction catalyst comprising Cu

to form the 2,5-bis-hydroxymethylfuran (BHMF) with at least about 90%selectivity and at least 85% 5-hydroxymethylfurfural (HMF) conversion.

77A. The process of embodiment 76A, wherein the organic solventcomprises dioxane.

78A. The process of embodiment 76A, wherein the organic solventcomprises isopropanol.

79A. The process of embodiment 76A, wherein the organic solventcomprises glyme.

80A. The process of any one of embodiments 76A-79A, wherein the organicsolvent comprises from about 5 weight % to about 20 weight % water.

81A. The process of any one of embodiments 76A-80A, wherein theheterogeneous reduction catalyst further comprises an alumina catalystsupport.

82A. A process for preparing 1,2,6-hexanetriol (HTO) from5-hydroxymethylfurfural (HMF) comprising:

(a) reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in acontinuous flow reactor in the presence of

-   -   (i) a first organic solvent comprising less than about 25 weight        % water, and    -   (ii) a first heterogeneous reduction catalyst comprising Cu

to form 2,5-bis-hydroxymethylfuran (BHMF);

(b) reacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen in thepresence of

-   -   (i) a second organic solvent comprising less than about 25        weight % water, and    -   (ii) a second heterogeneous reduction catalyst comprising Ni to        form 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF); and

(c) reacting the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) withhydrogen in the presence of

-   -   i) a third organic solvent comprising less than about 25 weight        % water, and    -   (ii) a third heterogeneous reduction catalyst comprising Pt to        form the 1,2,6-hexanetriol (HTO).

83A. The process of embodiment 82A, wherein the2,5-bis-hydroxymethylfuran (BHMF) is formed in a first reactor effluentstream or a first reactor zone effluent stream and is reacted withhydrogen without isolation or purification of the2,5-bis-hydroxymethylfuran (BHMF) from the first reactor effluent streamor the first reactor zone effluent stream.

84A. The process of any one of embodiments 82A-83A, wherein the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) is formed in a secondreactor effluent stream or a second reactor zone effluent stream and isreacted with hydrogen without isolation or purification of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from the second reactoreffluent stream or the second reactor zone effluent stream.

85A. The process of any one of embodiments 82A-84A, wherein one or moreof the first, second, and third organic solvents comprises dioxane.

86A. The process of embodiment 85A, wherein each of the first, second,and third organic solvents comprises dioxane.

87A. The process of claim any one of embodiments 82A-84A, wherein one ormore of the first, second, and third organic solvents comprisesisopropanol.

88A. The process of embodiment 87A, wherein each of the first, second,and third organic solvents comprises isopropanol.

89A. The process of embodiment 82A, wherein one or more of the first,second, and third organic solvents comprises glyme.

90A. The process of embodiment 89A, wherein each of the first, second,and third organic solvents comprises glyme.

91A. The process of any one of embodiments 82A-90A, wherein the thirdheterogeneous reduction catalyst further comprises tungsten.

92A. A process for preparing 1,6-hexanediol (HDO) from5-hydroxymethylfurfural (HMF) comprising:

(a) reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in acontinuous flow reactor in the presence of

-   -   (i) a first organic solvent comprising less than about 25 weight        % water, and    -   (ii) a first heterogeneous reduction catalyst comprising at        least one metal selected from the group consisting of Co, Mn,        Ni, and Cu or a combination thereof to form        2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF);

(b) reacting the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) withhydrogen in a continuous flow reactor the presence of

-   -   (i) a second organic solvent comprising less than about 25        weight % water, and    -   (ii) a second heterogeneous reduction catalyst comprising Pt to        form the 1,6-hexanetriol (HDO).

93A. The process of embodiment 92A, wherein the second heterogeneousreduction catalyst further comprises tungsten.

94A. The process of embodiment 92A or 93A, wherein the reaction of step(a) occurs within a first reaction zone and the reaction of step (b)occurs within a second reaction zone, wherein the first and secondreaction zones are contained within the same continuous flow reactor.

95A. The process of embodiment 92A or 93A, wherein the reaction of step(a) occurs within a first continuous flow reactor, and the reaction ofstep (b) occurs within a second continuous flow reactor.

96A. The process of any one of embodiments 92A-95A, wherein the reactionof step (a) comprises formation of 2,5-bis-hydroxymethylfuran (BHMF),and at least a portion of the 2,5-bis-hydroxymethylfuran (BHMF) isreacted with hydrogen in the continuous flow reactor to form2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF).

97A. The process of any one of embodiments 92A-96A, wherein the reactionof step (b) comprises formation of 1,2,6-hexanetriol (HTO), and at leasta portion of the 1,2,6-hexanetriol (HTO) is reacted with hydrogen in thecontinuous flow reactor to form 1,6-hexanediol (HDO).

98A. The process of any one of embodiments 92A-97A, wherein one or bothof the first and second organic solvents comprises dioxane.

99A. The process of any one of embodiments 92A-97A, wherein one or bothof the first and second organic solvents comprises isopropanol.

100A. The process of any one of embodiments 92A-97A, wherein one or bothof the first and second organic solvents comprises glyme.

101A. The process of any one of embodiments 92A-100A, wherein thetemperature in the reaction of step (b) is higher than the temperaturein the reaction of step (a).

102A. The process of any one of embodiments 92A-101A, wherein thepressure in the reaction of step (b) is higher than the pressure in thereaction of step (a).

103A. A continuous conversion system for producing a reduction product,wherein the continuous conversion system comprises:

(i) a first contained area for the reduction of a first reactant in thepresence of hydrogen and a heterogeneous reduction catalyst comprisingCu;

(ii) a second contained area for the reduction of a second reactant inthe presence of hydrogen and a heterogeneous reduction catalystcomprising Ni; and

(iii) a third contained area for the reduction of a third reactant inthe presence of hydrogen and a heterogeneous reduction catalystcomprising Pt;

wherein the contained areas are sequentially coupled such that thesecond reactant comprises the product of the first reduction reactionand the third reactant comprises the product of the second reductionreaction.

104A. The continuous conversion system of embodiment 103A, wherein thefirst and second contained areas are contained within a singlecontinuous flow reactor.

105A. The continuous conversion system of embodiment 103A or 104A,wherein the second and third contained areas are contained within asingle continuous flow reactor.

106A. The continuous conversion system of any one of embodiments103A-105A, wherein the reduction product comprises 1,2,6-hexanetriol(HTO).

107A. The continuous conversion system of any one of embodiments103A-106A, wherein the first reactant comprises 5-hydroxymethylfurfural(HMF), the second reactant comprises 2,5-bis-hydroxymethylfuran (BHMF),and the third reactant comprises 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF).

108A. The continuous conversion system of any one of embodiments103A-106A, further comprising a guard bed comprising a transition metal.

109A. The continuous conversion system of embodiment 108A, wherein theguard bed is coupled to the first contained area such that the firstreactant can be fed through the guard bed to the first contained area.

EXAMPLES Abbreviations

BET: Brunauer-Emmett-Teller method of determining surface area ofmaterials, such as catalyst support

Example 1 Conversion of HMF (1) to BHMF (2) in a Fixed Bed Reactor

Preparation of 1 wt. % Pt; 0.02 wt. % Au on Al₂O₃ catalyst. Solutionscontaining K₂Pt(OH)₆ were prepared by the reaction of Pt(OH)₂ (Alfa) andKOH (Fisher). Solutions containing KAuO₂ were prepared by dissolvingAu(OH)₃ (Alfa) in KOH solution at 70° C. for 3 hours with vigorousstirring. The Al₂O₃ support (BET surface area=30 m²/g) was obtained fromSaint Gobain. 0.8 mL of K₂Pt(OH)₆ solution (122 mg Pt/mL) was mixed with0.02 mL of KAuO₂ (102 mg Au/mL). The resultant mixture was diluted with4 mL deionized water and added to 10 g of the Al₂O₃ support. Theresultant material was dried at 120° C. for 15 minutes and then reducedat 250° C. with forming gas (5% H₂ in N₂) for 3 hours. The resultantcatalyst was washed 5 times with 20 mL of deionized water and dried at40° C. overnight.

1 g of the catalyst (1 g, 150-300 micron fraction) was placed into afixed bed reactor tube with an internal diameter of 4.5 mm A solution of0.4 M HMF in isopropanol (6.3 wt. %) was fed to the reactor at 110° C.under a partial pressure of hydrogen of 1000 psi at a flow rate of 100μL/min Results of the fixed bed run are presented in FIG. 1.

Example 2 Conversion of HMF (1) to BHMF (2) in a Fixed Bed Reactor witha Guard Bed

Preparation of 1 wt. % Co; 5 wt. % Cu on ZrO₂ catalyst. Cobalt nitrateand copper nitrate solutions were prepared by dissolving Co(NO₃).6H₂O(Sigma-Aldrich) and Cu(NO₃).3H₂O (Sigma-Aldrich) in deionized water. TheZrO₂ support (BET surface area=40 m²/g) was obtained from Saint Gobain.0.45 mL of cobalt nitrate solution (237 mg Co/mL) was mixed with 2 mL ofcopper nitrate solution (266 mg Cu/mL) to give a Co:Cu weight ratio of1:5. This mixture was diluted with 0.55 mL of deionized water and addedto 10 g of the ZrO₂ support. The resultant material was dried at 120° C.for 2 hours and calcined at 350° C. for 3 hours in air. After thecalcination step the catalyst was reduced under forming gas flow at 350°C. for 3 hours.

Preparation of 5.1 wt. % Ag on ZrO₂ guard bed. Silver acetate solutionwas prepared by dissolving anhydrous silver acetate (Alfa) in 5 M NH₄OH.The ZrO₂ support (BET surface area=40 m²/g) was obtained from SaintGobain. 3 mL of the silver acetate solution (180 mg Ag/mL) was added to10 g of the ZrO2 support. The resultant material was dried at 120° C.for 2 hours and calcined at 250° C. for 3 hours in air. After thecalcination step the guard bed material was reduced under forming gasflow at 300° C. for 3 hours.

1.35 g of the Co—Cu catalyst (150-300 micron fraction) was placed into afixed bed reactor tube with an internal diameter of 4.5 mm A guard bedreactor tube with an internal diameter of 4.5 mm was filled with 5 g ofguard bed material (150-300 micron fraction) and placed in the front ofcatalyst bed reactor. A solution of 0.4 M HMF in isopropanol (6.3 wt. %)was fed to the guard bed at 30° C. and the reactor at 110° C. at a flowrate of 100 μL/min Both the guard bed and the reactor were under apartial pressure of hydrogen of 1000 psi. Results of the fixed bed runare presented in FIG. 2.

Comparative Example 3 Conversion of HMF (1) to BHMF (2) in a Fixed BedReactor without a Guard Bed

Preparation of 1 wt. % Co, 5 wt. % Cu on ZrO2 catalyst. The catalyst wasprepared according to the method described in Example 2.

1.35 g of the Co—Cu catalyst (150-300 micron fraction) was placed into afixed bed reactor tube with an internal diameter of 4.5 mm A solution of0.4 M HMF in isopropanol (6.3 wt. %) was fed to the reactor at 110° C.under a partial pressure of hydrogen of 1000 psi at a flow rate of 100μL/min Results of the fixed bed run are presented in FIG. 3. After 170hours on-stream the onset of catalyst deactivation was observed.

Comparative Example 4 Conversion of HMF (1) to BHMF (2) in a Fixed BedReactor Using Water as a Solvent

Preparation of 1 wt. % Co; 5 wt. % Cu on ZrO₂ catalyst. The catalyst wasprepared according to the method described in Example 2.

6 g of the Co—Cu catalyst (150-300 micron fraction) was placed into afixed bed reactor tube with an internal diameter of 4.5 mm A solution of0.4 M HMF in water (5 wt. %) was fed to the reactor at 100° C. under apartial pressure of hydrogen of 1000 psi. The flow rate was variedbetween 150 μL/min and 400 μL/min during the course of the run. Resultsof the fixed bed run are presented in FIG. 4. At the onset of catalystdeactivation, the flow rate was reduced in an attempt to reach a stablecondition. Catalyst deactivation continued to the point where no HMFconversion was observed.

Example 5 Conversion of HMF (1) to BHMF (2) in a Fixed Bed Reactor witha Guard Bed

Preparation of 1 wt. % Pt, 0.02 wt. % Au on Al₂O₃ catalyst. The catalystwas prepared according to the method described in Example 1.

Preparation of 7.4 wt. % Cu on ZrO₂ guard bed. A copper nitrate solutionwas prepared by dissolving Cu(NO₃).3H₂O (Sigma-Aldrich) in deionizedwater. The ZrO₂ support (BET surface area=40 m²/g) was obtained fromSaint Gobain. 3 mL of the copper nitrate solution (265 mg Cu/mL) wasadded to 10 g of the ZrO₂ support. The resultant material was dried at120° C. for 2 hours, calcined in air at 350° C. for 3 hours and reducedunder forming gas flow at 220° C. for 6 hours.

The Pt—Au catalyst (2 g) was placed into a fixed bed reactor tube withan internal diameter of 4.5 mm A guard bed reactor tube with an internaldiameter of 4.5 mm was filled with 5 g of guard bed material (150-300micron fraction) and this was placed in the front of catalyst bedreactor. A solution of 0.8 M HMF in isopropanol (12.5 wt. %) was fed tothe guard bed at 100° C. and the reactor was held at 110° C. at a flowrate of 100 μL/min Both the guard bed and the reactor were under apartial pressure of hydrogen of 1000 psi. Results of the fixed bed runare presented in FIG. 5.

Example 6 Conversion of HMF (1) to BHMF (2) in a Fixed Bed Reactor witha Guard Bed

Preparation of 8.9 wt. % Ag on Al₂O₃ catalyst. The silver acetatesolution was prepared by dissolving anhydrous silver acetate (Alfa) in 5M NH₄OH. The Al₂O₃ support (BET surface area=260 m²/g) was obtained fromSaint Gobain. 2.87 mL of silver acetate solution (170 mg Ag/mL) wasadded to 5 g of the Al₂O₃ support. The resultant material was dried at120° C. for 2 hours and calcined in air at 250° C. for 3 hours. Thecalcined material was reduced under forming gas flow at 300° C. for 3hours.

Preparation of 7.0 wt. % Ag on ZrO₂ guard bed. The silver nitratesolution was prepared by dissolving silver nitrate (Alfa) in deionizedwater. The ZrO₂ support (BET surface area=40 m²/g) was obtained fromSaint Gobain. 1.48 mL of the silver nitrate solution (254 mg Ag/mL) wasadded to 5 g of the ZrO₂ support. The resultant material was dried at120° C. for 2 hours and calcined at 400° C. for 3 hours in air. Afterthe calcination step the guard bed material was reduced under nitrogengas flow at 300° C. for 4 hours.

2 g of silver catalyst (150-300 micron fraction) was placed into a fixedbed reactor tube with an internal diameter of 4.5 mm A guard bed reactortube with an internal diameter of 4.5 mm was filled with 3 g of guardbed material (150-300 micron fraction) and placed in the front ofcatalyst bed reactor. A solution of 0.4 M HMF in isopropanol (6.3 wt. %)was fed to the guard bed and the reactor at a flow rate of 100 μL/minBoth the guard bed and the reaction temperatures were 80° C. for 0 to400 hours and 90° C. for 400 to 600 hours and both the guard bed and thereactor were under a partial pressure of hydrogen of 1000 psi. Resultsof the fixed bed run are presented in FIG. 6.

Example 7 Conversion of HMF (1) to BHMF (2) in a Fixed Bed Reactor witha Guard Bed

Preparation of 10 wt. % Ag on Al₂O₃ catalyst. The silver nitratesolution was prepared by dissolving silver nitrate (Alfa) in deionizedwater. The Al₂O₃ support (BET surface area=160 m²/g) was obtained fromSasol (Sasol 1/160). 4.37 mL of the silver nitrate solution (254 mgAg/mL) was diluted with 2.13 mL of deionized water and added to 10 g ofthe Al₂O₃ support. The resultant material was dried at 120° C. for 2hours and calcined in air at 400° C. for 3 hours. The calcined materialwas reduced under nitrogen flow at 300° C. for 3 hours.

Preparation of 7.0 wt. % Ag on ZrO₂ guard bed. The silver nitratesolution was prepared by dissolving silver nitrate (Alfa) in deionizedwater. The ZrO₂ support (BET surface area=40 m²/g) was obtained fromSaint Gobain. 1.48 mL of the silver acetate solution (254 mg Ag/mL) wasadded to 5 g of the ZrO₂ support. The resultant material was dried at120° C. for 2 hours and calcined at 400° C. for 3 hours in air. Afterthe calcination step the guard bed material was reduced under nitrogengas flow at 300° C. for 4 hours.

4.8 g of silver catalyst (150-300 micron fraction) was placed into afixed bed reactor tube with an internal diameter of 4.5 mm A guard bedreactor tube with an internal diameter of 4.5 mm was filled with 3.5 gof guard bed material (150-300 micron fraction) and placed in the frontof catalyst bed reactor. A solution of 0.8 M HMF in isopropanol (12.6wt. %) was fed to the guard bed and the reactor at a flow rate of 100μL/min Both the guard bed and the reactor were at 80° C. and under apartial pressure of hydrogen of 1000 psi. Results of the fixed bed runare presented in FIG. 7.

Example 8 Consecutive Conversion of HMF (1) to BHMF (2) to BHMTHF (3) ina Fixed Bed Reactor with a Guard Bed

Preparation of 3 wt. % Ni, 3 wt. % Cu on ZrO₂ catalyst. Nickel nitrateand copper nitrate solutions were prepared by dissolving Ni(NO₃).6H₂O(Alfa) and Cu(NO₃).3H₂O (Sigma-Aldrich) in deionized water. The ZrO₂support (BET surface area=40 m²/g) was obtained from Saint Gobain. 1.75mL of nickel nitrate solution (181 mg Ni/mL) was mixed with 1.2 mL ofcopper nitrate solution (265 mg Cu/mL) to produce a solution with aweight ratio of 1:1. This solution was added to 10 g of the ZrO₂support. The resultant material was dried at 120° C. for 2 hours,calcined in air at 350° C. for 3 hours and reduced under forming gasflow at 430° C. for 3 hours.

Preparation of 5.6 wt. % Ag on ZrO₂ guard bed. Silver acetate solutionwas prepared by dissolving silver acetate in 5M NH₄OH. The ZrO₂ support(BET surface area=40 m²/g) was obtained from Saint Gobain. 3 mL of thesolution (198 mg Ag/mL) was added to 10 g of the ZrO₂ support. Theresultant material was dried at 120° C. for 2 hours, calcined in air at250° C. for 3 hours and reduced under forming gas flow at 350° C. for 5hours.

1.35 g of the Ni—Cu catalyst (150-300 micron fraction) was placed into afixed bed reactor tube with an internal diameter of 4.5 mm A guard bedreactor tube with an internal diameter of 4.5 mm was filled with 5 g ofguard bed material (150-300 micron fraction) and placed in the front ofcatalyst bed reactor. A solution of 0.4 M HMF in isopropanol (6.3 wt. %)was fed to the guard bed at 80° C. and the reactor at 120° C. at a flowrate of 100 μL/min Both the guard bed and the reactor were under apartial pressure of hydrogen of 750 psi. Results of the fixed bed runare presented in FIG. 8 (illustrated from 150 hours onward in FIG. 8).

Example 9 Consecutive Conversion of HMF (1) to BHMF (2) to BHMTHF (3) ina Fixed Bed Reactor with a Guard Bed

Preparation of 5.0 wt. % Ni on ZrO₂ catalyst. Nickel nitrate solutionwas prepared by dissolving Ni(NO₃)₂.6H₂O (Alfa) in deionized water. TheZrO₂ support (BET surface area=40 m²/g) was obtained from Saint Gobain.Nickel nitrate solution (2.9 mL, 181 mg Ni/mL) was added to 10 g of theZrO₂ support. The resultant material was dried at 120° C. for 2 hours,calcined in air at 350° C. for 3 hours and reduced under forming gasflow at 430° C. for 3 hours.

Preparation of the 7.0 wt. % Ag on ZrO₂ guard bed. Silver nitratesolution was prepared by dissolving silver nitrate in deionized water.The ZrO₂ support (BET surface area=40 m²/g) was obtained from SaintGobain. 1.48 mL of the solution (254 mg Ag/mL) was added to 5 g of ZrO₂.The resultant material was dried at 120° C. for 2 hours, calcined at400° C. for 3 hours in air and reduced under a N₂ flow at 300° C. for 4hours.

5 g of the Ni catalyst (150-300 micron fraction) was placed into a fixedbed reactor tube with an internal diameter of 4.5 mm A guard bed reactortube with an internal diameter of 4.5 mm was filled with 4.8 g of guardbed material (150-300 micron fraction) and this was placed in the frontof catalyst bed reactor. A solution 0.4 M HMF in isopropanol (6.3 wt. %)was fed to the guard bed at 80° C. and the reactor at 90-110° C. at aflow rate of 100 μL/min Both the guard bed and the reactor were under apartial pressure of hydrogen of 1000 psi. Results of the fixed bed runare presented in FIG. 9.

Example 10 Conversion of BHMTHF (3) to HTO (4) in a Fixed Bed Reactor

Using hydrogen and a Pt—W on ZrO₂ catalyst prepared, for example,according to the procedure described in International Publication No. WO2013/109477, an aqueous BHMTHF solution (for example, ≧0.35M) can beconverted into HTO in a fixed bed reactor over on-stream periods of 100hours or more under conditions such as those described in InternationalPublication No. WO 2013/109477.

Example 11 Consecutive Conversion of HMF (1) to BHMF (2) to HTO (4) in aFixed Bed Reactor with a Guard Bed

Preparation of 17.3 wt. % Cu on Al₂O₃ catalyst. Copper nitrate solution(3.95 mL, Sigma Aldrich) in DI water (265 mg Cu/mL) was added to 5 g ofan Al₂O₃ support (XA 6175 BET surface area=260 m²/g) obtained from SaintGobain. The resultant material was dried at 120° C. for 2 hours,calcined in air at 350° C. for 3 hours and then reduced under forminggas flow at 220° C. for 6 hours.

Preparation of the 7.0 wt. % Ag on ZrO₂ guard bed. Silver nitratesolution was prepared by dissolving silver nitrate in deionized water.The ZrO₂ support (BET surface area=40 m²/g) was obtained from SaintGobain. 1.48 mL of the solution (254 mg Ag/mL) was added to 5 g of ZrO₂.The resultant material was dried at 120° C. for 2 hours, calcined at400° C. for 3 hours in air and reduced under a N₂ flow at 300° C. for 4hours.

2.5 g of the copper catalyst (150-425 micron fraction) was placed into afixed bed reactor tube with internal diameter of 4.5 mm A guard bedreactor tube with an internal diameter of 4.5 mm was filled with 4.8 gof guard bed material (150-425 micron fraction) and this was placed inthe front of catalyst bed reactor. A solution of 0.4 M HMF inisopropanol (6.3 wt. %) was fed to the guard bed (temperature 80° C. forthe first 100 hours, 30° C. from 100-170 hours), and the reactor(catalyst bed temperature 105-120° C.) at a flow rate of 100 μL/min. Thetemperature of the guard bed was reduced at about 100 hours on-stream inresponse to sample analysis. Both the guard bed and the reactor wereunder a partial pressure of hydrogen of 750-1100 psi. The hydrogenpressure was adjusted at specific time points in response to sampleanalysis. During the course of the 170 hour run, HMF was fullyconverted, BHMF was observed as intermediate and HTO was produced with aconsistent yield. No BHMTHF was observed during the course of the 170hour run indicating the direct conversion of BHMF to HTO.

Example 12 Consecutive Conversion of HMF (1) to BHMF (2) to BHMTHF (3)in a Fixed Bed Reactor with a Guard Bed Using an Extrudate Catalyst

Preparation of 14 wt. % Ni on Al₂O₃ Extrudate. Nickel nitrate solutionwas prepared by dissolving Ni(NO₃)₂.6H₂O (Alfa) in DI water. Al₂O₃support (SA 31132, 1.5 mm extrudates, BET surface area=55 m²/g) wasobtained from Saint Gobain. Nickel nitrate solution (17.83 mL, 181 mgNi/mL) was added to 20 g of the Al₂O₃ support. The resultant materialwas dried at 120° C. for 2 hours, calcined in air at 350° C. for 3 hoursand then reduced under forming gas flow at 380° C. for 1 hour andsubsequently 430° C. for 3 hours.

Preparation of 14 wt. % Ag on Al₂O₃ spheres guard bed. Silver nitratesolution was prepared by dissolving silver nitrate (Strem) in DI water.Al₂O₃ support (Sasol 1/160, 1.0 mm spheres, BET surface area=160 m²/g)was obtained from Sasol. Silver nitrate solution (12.82 mL, 254 mgAg/mL) was added to 20 g of the Al₂O₃ support. The resultant materialwas dried at 120° C. for 2 hours, calcined at 400° C. for 3 hours in airand then reduced under a N₂ flow at 300° C. for 4 hours.

11.3 g of the extrudate Ni catalyst was placed into a fixed bed reactortube with an internal diameter of 10.2 mm A guard bed reactor tube withan internal diameter of 10.2 mm was filled with 16 g of guard bedmaterial and this was placed in the front of catalyst bed reactor. Asolution of 0.4 M HMF in isopropanol (6.3 wt. %) was fed to the guardbed (temperature 80-90° C.) and the reactor/catalyst bed (temperature110° C.) at a flow rate of 500 μL/min for 0-290 hours, followed by asolution of 0.8 M HMF in isopropanol (12.6 wt. %) for 290-350 hours.Both the guard bed and the reactor were under a partial pressure ofhydrogen of 1000 psi. Results of the fixed bed run are presented in FIG.10.

Example 13 Consecutive Conversion of HMF (1) to BHMF (2) in a Fixed BedReactor with a Guard Bed Using Catalyst Spheres

Preparation of 14 wt. % Ag on Al₂O₃ catalyst spheres. Silver nitratesolution was prepared by dissolving silver nitrate (Strem) in DI water.Al₂O₃ support (Sasol 1/160, 1.0 mm spheres, BET surface area=160 m²/g)was obtained from Sasol. Silver nitrate solution (26 mL, 253 mg Ag/mL)was added to 40 g of the Al₂O₃ support. The resultant material was driedat 120° C. for 2 hours, calcined in air at 400° C. for 3 hours and thenreduced under N₂ flow at 300° C. for 3 hours.

Preparation of 14 wt. % Ag on Al₂O₃ guard bed spheres. Silver nitratesolution was prepared by dissolving silver nitrate (Strem) in DI water.Al₂O₃ support (Sasol 1/160, 1.0 mm spheres, BET surface area=160 m²/g)was obtained from Sasol. Silver nitrate solution (26 mL, 253 mg Ag/mL)was added to 40 g of the Al₂O₃ support. The resultant material was driedat 120° C. for 2 hours, calcined in air at 400° C. for 3 hours and thenreduced under N₂ flow at 300° C. for 3 hours.

16 g of the Ag catalyst was placed into a fixed bed reactor tube with aninternal diameter of 10.2 mm A guard bed reactor tube with an internaldiameter of 10.2 mm was filled with 16 g of guard bed material and thiswas placed in the front of catalyst bed reactor. A solution of 0.4 M HMFin isopropanol (6.3 wt. %) was fed to the guard bed (temperature 80° C.)and the reactor/catalyst bed (temperature 80° C.) at a flow rate of 500μL/min for 0-265 hours, followed by a solution of 0.8 M HMF inisopropanol (12.6 wt. %) for 265-350 hours. Both the guard bed and thereactor were under a partial pressure of hydrogen of 1000 psi. Resultsof the fixed bed run are presented in FIG. 11.

Example 14 Conversion of HMF (1) to BHMF (2) in a Fixed Bed ReactorUsing Various Solvent Compositions

17.6 g of a commercial Cu/Mn/Al₂O₃ catalyst (T-4874 supplied byClariant; supplied as a 1/16″ extrudate) was reduced in a tube furnaceunder a flow of 5% H₂ in N₂ for 6 hours and then brought to roomtemperature followed by exposure to a flow of 0.5% O₂ in N₂ for 1 hour.The resultant catalyst was placed into a fixed bed reactor tube with aninternal diameter of 10.2 mm A solution of 0.4 M HMF in a solventmixture of 87:13 isopropanol:H₂O (as a weight ratio) was fed to thereactor at a flow rate of 500 μL/min for a period of 1100 hours. Thereactor was under a partial pressure of hydrogen of 1000 psi. Thereactor temperature was set to 70° C., 75° C. and 80° C. at variousstages during the 1100 hours. For the duration of the 1100 hours onstream, the HMF conversion was >90% and the selectivity to BHMF was>90%.

After 1100 hours on stream, the reactor feed was switched to a solutionof 0.4 M HMF in a 82:18 Dioxane:H₂O (as a weight ratio), which was fedto the reactor (reactor temperature 70° C., partial pressure of hydrogen1000 psi) at a flow rate of 500 μL/min for a further period of 100hours, during which the HMF conversion was >90% and the selectivity toBHMF was >85%.

What is claimed is:
 1. A process for preparing2,5-bis-hydroxymethylfuran (BHMF) from 5-hydroxymethylfurfural (HMF)comprising: reacting the 5-hydroxymethylfurfural (HMF) with hydrogen ina continuous flow reactor in the presence of an organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ru or acombination thereof to form the 2,5-bis-hydroxymethylfuran (BHMF),wherein the process further comprises one or more of (i)-(iii): (i)forming the 2,5-bis-hydroxymethylfuran (BHMF) over an on-stream periodof at least 150 hours; (ii) feeding the 5-hydroxymethylfurfural (HMF)through a guard bed comprising a transition metal to the continuous flowreactor; (iii) feeding the 5-hydroxymethylfurfural (HMF) to thecontinuous flow reactor for an on-stream period of at least 150 hours.2. The process of claim 1, wherein the 2,5-bis-hydroxymethylfuran (BHMF)is formed with at least about 90% selectivity and at least 85%conversion of the 5-hydroxymethylfurfural (HMF).
 3. The process of claim1, wherein the organic solvent comprises less than about 25 weight %water.
 4. The process of claim 1, wherein the heterogeneous reductioncatalyst further comprises a modifier.
 5. The process of claim 1,wherein the heterogeneous reduction catalyst further comprises acatalyst support.
 6. The process of claim 1, wherein the5-hydroxymethylfurfural (HMF) is reacted with hydrogen at a temperaturein a range of about 50° C. to about 150° C. and at a pressure in a rangeof about 50 psi to about 2000 psi.
 7. The process of claim 1, furthercomprising reacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogenin a continuous flow reactor in the presence of an organic solvent and aheterogeneous reduction catalyst comprising at least one metal selectedfrom the group consisting of Ni, Co, Cu, Ag, Pd, Pt and Ru or acombination thereof to form 2,5-bis-hydroxymethyltetrahydrofuran(BHMTHF).
 8. The process of claim 7, further comprising reacting the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen in acontinuous flow reactor in the presence of an aqueous or organic solventand a heterogeneous reduction catalyst comprising at least one metalselected from the group consisting of Ni, Co, Cu, Ag, Pt and Ru or acombination thereof to form 1,2,6-hexanetriol (HTO).
 9. The process ofclaim 1, further comprising reacting the 2,5-bis-hydroxymethylfuran(BHMF) with hydrogen in a continuous flow reactor at a pressure in arange of about 50 psi to about 2000 psi in the presence of an aqueous ororganic solvent and a heterogeneous reduction catalyst comprising atleast one metal selected from the group consisting of Ni, Co, Cu, Ag,Pt, Pd and Ru or a combination thereof to form 1,2,6-hexanetriol (HTO).10. The process of claim 8, further comprising reacting the1,2,6-hexanetriol (HTO) with hydrogen in a continuous flow reactor inthe presence of a heterogeneous reduction catalyst comprising at leastone metal selected from the group consisting of Ni, Co, Cu, Ag, Pt andRu or a combination thereof to form 1,6-hexanediol (HDO).
 11. A processfor preparing 1,2,6-hexanetriol (HTO) from 5-hydroxymethylfurfural (HMF)comprising: (a) feeding 5-hydroxymethylfurfural (HMF) to a continuousflow reactor at a concentration of greater than about 5 weight percentin a first organic solvent; (b) reacting the 5-hydroxymethylfurfural(HMF) with hydrogen in the continuous flow reactor in the presence ofthe first organic solvent and a first heterogeneous reduction catalystcomprising at least one metal selected from the group consisting of Ni,Co, Cu, Ag, Pt, Pd, Fe and Ru or a combination thereof to form2,5-bis-hydroxymethylfuran (BHMF) in a first reactor effluent stream ora first reactor zone effluent stream; (c) reacting the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen, without isolation orpurification of the 2,5-bis-hydroxymethylfuran (BHMF) from the firstreactor effluent stream or the first reactor zone effluent stream, inthe presence of a second heterogeneous reduction catalyst to form2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) in a second reactoreffluent stream or a second reactor zone effluent stream; and (d)reacting the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) withhydrogen, without isolation or purification of the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from the second reactoreffluent stream or the second reactor zone effluent stream, in thepresence of a third heterogeneous reduction catalyst to form the1,2,6-hexanetriol (HTO).
 12. The process of claim 11, wherein the firstorganic solvent comprises less than about 25 weight % water.
 13. Aprocess for preparing 1,2,6-hexanetriol (HTO) from5-hydroxymethylfurfural (HMF) comprising: feeding the5-hydroxymethylfurfural (HMF) to a continuous flow reactor at aconcentration of greater than about 5 weight percent in a first organicsolvent; reacting the 5-hydroxymethylfurfural (HMF) with hydrogen in thecontinuous flow reactor in the presence of the first organic solvent anda first heterogeneous reduction catalyst comprising at least one metalselected from the group consisting of Ni, Co, Cu, Ag, Pt, Pd, Fe and Ruor a combination thereof to form 2,5-bis-hydroxymethylfuran (BHMF) in afirst reactor effluent stream or a first reactor zone effluent stream;and reacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen,without isolation or purification of the 2,5-bis-hydroxymethylfuran(BHMF) from the first reactor effluent stream or the first reactor zoneeffluent stream, in the presence of a second heterogeneous reductioncatalyst to form the 1,2,6-hexanetriol (HTO).
 14. A process forpreparing 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) from2,5-bis-hydroxymethylfuran (BHMF) comprising: reacting the2,5-bis-hydroxymethylfuran (BHMF) with hydrogen in a continuous flowreactor at a pressure in a range of about 50 psi to about 2000 psi inthe presence of: (i) an organic solvent comprising less than about 25weight % water, and (ii) a heterogeneous reduction catalyst comprisingat least one metal selected from the group consisting of Ni, Co, Cu, Ag,Pd, Pt and Ru or a combination thereof to form the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF).
 15. A process forpreparing 1,2,6-hexanetriol (HTO) and 1,6-hexanediol (HDO) from2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) comprising: reacting the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen in acontinuous flow reactor at a pressure in a range of about 50 psi toabout 2000 psi in the presence of: (i) an organic solvent comprisingless than about 25 weight % water, and (ii) a heterogeneous reductioncatalyst comprising at least one metal selected from the groupconsisting of Ni, Co, Cu, Ag, Pt and Ru or a combination thereof to formthe 1,2,6-hexanetriol (HTO) and the 1,6-hexanediol (HDO) with at leastabout 90% combined selectivity and at least 85%2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) conversion.
 16. A processfor preparing 2,5-bis-hydroxymethylfuran (BHMF) from5-hydroxymethylfurfural (HMF) comprising: reacting the5-hydroxymethylfurfural (HMF) with hydrogen in a continuous flow reactorat a pressure in a range of about 50 psi to about 2000 psi in thepresence of (i) an organic solvent comprising less than about 25 weight% water, and (ii) a heterogeneous reduction catalyst comprising Cu toform the 2,5-bis-hydroxymethylfuran (BHMF) with at least about 90%selectivity and at least 85% 5-hydroxymethylfurfural (HMF) conversion.17. A process for preparing 1,2,6-hexanetriol (HTO) from5-hydroxymethylfurfural (HMF) comprising: (a) reacting the5-hydroxymethylfurfural (HMF) with hydrogen in a continuous flow reactorin the presence of (i) a first organic solvent comprising less thanabout 25 weight % water, and (ii) a first heterogeneous reductioncatalyst comprising Cu to form 2,5-bis-hydroxymethylfuran (BHMF); (b)reacting the 2,5-bis-hydroxymethylfuran (BHMF) with hydrogen in thepresence of (i) a second organic solvent comprising less than about 25weight % water, and (ii) a second heterogeneous reduction catalystcomprising Ni to form 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF); and(c) reacting the 2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) withhydrogen in the presence of (i) a third organic solvent comprising lessthan about 25 weight % water, and (ii) a third heterogeneous reductioncatalyst comprising Pt to form the 1,2,6-hexanetriol (HTO).
 18. Theprocess of claim 17, wherein one or more of the first, second, and thirdorganic solvents comprises dioxane.
 19. The process of claim 17, whereinone or more of the first, second, and third organic solvents comprisesisopropanol.
 20. A process for preparing 1,6-hexanediol (HDO) from5-hydroxymethylfurfural (HMF) comprising: (a) reacting the5-hydroxymethylfurfural (HMF) with hydrogen in a continuous flow reactorin the presence of (i) a first organic solvent comprising less thanabout 25 weight % water, and (ii) a first heterogeneous reductioncatalyst comprising at least one metal selected from the groupconsisting of Co, Mn, Ni, and Cu or a combination thereof to form2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF); (b) reacting the2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF) with hydrogen in acontinuous flow reactor the presence of (i) a second organic solventcomprising less than about 25 weight % water, and (ii) a secondheterogeneous reduction catalyst comprising Pt to form the1,6-hexanetriol (HDO).
 21. The process of claim 20, wherein the reactionof step (a) comprises formation of 2,5-bis-hydroxymethylfuran (BHMF),and at least a portion of the 2,5-bis-hydroxymethylfuran (BHMF) isreacted with hydrogen in the continuous flow reactor to form2,5-bis-hydroxymethyltetrahydrofuran (BHMTHF).
 22. The process of claim20, wherein one or both of the first and second organic solventscomprises dioxane.
 23. The process of claim 20, wherein one or both ofthe first and second organic solvents comprises isopropanol.
 24. Acontinuous conversion system for producing a reduction product, whereinthe continuous conversion system comprises: (iv) a first contained areafor the reduction of a first reactant in the presence of hydrogen and aheterogeneous reduction catalyst comprising Cu; (v) a second containedarea for the reduction of a second reactant in the presence of hydrogenand a heterogeneous reduction catalyst comprising Ni; and (vi) a thirdcontained area for the reduction of a third reactant in the presence ofhydrogen and a heterogeneous reduction catalyst comprising Pt; whereinthe contained areas are sequentially coupled such that the secondreactant comprises the product of the first reduction reaction and thethird reactant comprises the product of the second reduction reaction.25. The continuous conversion system of claim 24, further comprising aguard bed comprising a transition metal.